/*

Copyright (C) 2004-2018 David Bateman
Copyright (C) 1998-2004 Andy Adler
Copyright (C) 2008 Jaroslav Hajek

This file is part of Octave.

Octave is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Octave is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<https://www.gnu.org/licenses/>.

*/

#if ! defined (octave_Sparse_op_defs_h)
#define octave_Sparse_op_defs_h 1

#include "octave-config.h"

#include "Array-util.h"
#include "lo-array-errwarn.h"
#include "mx-inlines.cc"
#include "oct-locbuf.h"

// sparse matrix by scalar operations.

#define SPARSE_SMS_BIN_OP_1(R, F, OP, M, S)                             \
  R                                                                     \
  F (const M& m, const S& s)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
                                                                        \
    R r (nr, nc, (0.0 OP s));                                           \
                                                                        \
    for (octave_idx_type j = 0; j < nc; j++)                            \
      for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++)       \
        r.xelem (m.ridx (i), j) = m.data (i) OP s;                      \
    return r;                                                           \
  }

#define SPARSE_SMS_BIN_OP_2(R, F, OP, M, S)             \
  R                                                     \
  F (const M& m, const S& s)                            \
  {                                                     \
    octave_idx_type nr = m.rows ();                     \
    octave_idx_type nc = m.cols ();                     \
    octave_idx_type nz = m.nnz ();                      \
                                                        \
    R r (nr, nc, nz);                                   \
                                                        \
    for (octave_idx_type i = 0; i < nz; i++)            \
      {                                                 \
        r.xdata (i) = m.data (i) OP s;                  \
        r.xridx (i) = m.ridx (i);                       \
      }                                                 \
    for (octave_idx_type i = 0; i < nc + 1; i++)        \
      r.xcidx (i) = m.cidx (i);                         \
                                                        \
    r.maybe_compress (true);                            \
    return r;                                           \
  }

#define SPARSE_SMS_BIN_OPS(R1, R2, M, S)        \
  SPARSE_SMS_BIN_OP_1 (R1, operator +, +, M, S) \
  SPARSE_SMS_BIN_OP_1 (R1, operator -, -, M, S) \
  SPARSE_SMS_BIN_OP_2 (R2, operator *, *, M, S) \
  SPARSE_SMS_BIN_OP_2 (R2, operator /, /, M, S)

#define SPARSE_SMS_CMP_OP(F, OP, M, MZ, MC, S, SZ, SC)                  \
  SparseBoolMatrix                                                      \
  F (const M& m, const S& s)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    if (MC (MZ) OP SC (s))                                              \
      {                                                                 \
        r = SparseBoolMatrix (nr, nc, true);                            \
        for (octave_idx_type j = 0; j < nc; j++)                        \
          for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++)   \
            if (! (MC (m.data (i)) OP SC (s)))                          \
              r.data (m.ridx (i) + j * nr) = false;                     \
        r.maybe_compress (true);                                        \
      }                                                                 \
    else                                                                \
      {                                                                 \
        r = SparseBoolMatrix (nr, nc, m.nnz ());                        \
        r.cidx (0) = static_cast<octave_idx_type> (0);                  \
        octave_idx_type nel = 0;                                        \
        for (octave_idx_type j = 0; j < nc; j++)                        \
          {                                                             \
            for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
              if (MC (m.data (i)) OP SC (s))                            \
                {                                                       \
                  r.ridx (nel) = m.ridx (i);                            \
                  r.data (nel++) = true;                                \
                }                                                       \
            r.cidx (j + 1) = nel;                                       \
          }                                                             \
        r.maybe_compress (false);                                       \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMS_CMP_OPS(M, MZ, CM, S, SZ, CS)                \
  SPARSE_SMS_CMP_OP (mx_el_lt, <,  M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_le, <=, M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_ge, >=, M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_gt, >,  M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_eq, ==, M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_ne, !=, M, MZ,   , S, SZ,   )

#define SPARSE_SMS_EQNE_OPS(M, MZ, CM, S, SZ, CS)               \
  SPARSE_SMS_CMP_OP (mx_el_eq, ==, M, MZ,   , S, SZ,   )        \
  SPARSE_SMS_CMP_OP (mx_el_ne, !=, M, MZ,   , S, SZ,   )

#define SPARSE_SMS_BOOL_OP(F, OP, M, S, LHS_ZERO, RHS_ZERO)             \
  SparseBoolMatrix                                                      \
  F (const M& m, const S& s)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    if (nr > 0 && nc > 0)                                               \
      {                                                                 \
        if (LHS_ZERO OP (s != RHS_ZERO))                                \
          {                                                             \
            r = SparseBoolMatrix (nr, nc, true);                        \
            for (octave_idx_type j = 0; j < nc; j++)                    \
              for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
                if (! ((m.data (i) != LHS_ZERO) OP (s != RHS_ZERO)))    \
                  r.data (m.ridx (i) + j * nr) = false;                 \
            r.maybe_compress (true);                                    \
          }                                                             \
        else                                                            \
          {                                                             \
            r = SparseBoolMatrix (nr, nc, m.nnz ());                    \
            r.cidx (0) = static_cast<octave_idx_type> (0);              \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < nc; j++)                    \
              {                                                         \
                for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
                  if ((m.data (i) != LHS_ZERO) OP (s != RHS_ZERO))      \
                    {                                                   \
                      r.ridx (nel) = m.ridx (i);                        \
                      r.data (nel++) = true;                            \
                    }                                                   \
                r.cidx (j + 1) = nel;                                   \
              }                                                         \
            r.maybe_compress (false);                                   \
          }                                                             \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMS_BOOL_OPS2(M, S, LHS_ZERO, RHS_ZERO)          \
  SPARSE_SMS_BOOL_OP (mx_el_and, &&, M, S, LHS_ZERO, RHS_ZERO)  \
  SPARSE_SMS_BOOL_OP (mx_el_or,  ||, M, S, LHS_ZERO, RHS_ZERO)

#define SPARSE_SMS_BOOL_OPS(M, S, ZERO)         \
  SPARSE_SMS_BOOL_OPS2(M, S, ZERO, ZERO)

// scalar by sparse matrix operations.

#define SPARSE_SSM_BIN_OP_1(R, F, OP, S, M)                             \
  R                                                                     \
  F (const S& s, const M& m)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
                                                                        \
    R r (nr, nc, (s OP 0.0));                                           \
                                                                        \
    for (octave_idx_type j = 0; j < nc; j++)                            \
      for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++)       \
        r.xelem (m.ridx (i), j) = s OP m.data (i);                      \
                                                                        \
    return r;                                                           \
  }

#define SPARSE_SSM_BIN_OP_2(R, F, OP, S, M)             \
  R                                                     \
  F (const S& s, const M& m)                            \
  {                                                     \
    octave_idx_type nr = m.rows ();                     \
    octave_idx_type nc = m.cols ();                     \
    octave_idx_type nz = m.nnz ();                      \
                                                        \
    R r (nr, nc, nz);                                   \
                                                        \
    for (octave_idx_type i = 0; i < nz; i++)            \
      {                                                 \
        r.xdata (i) = s OP m.data (i);                  \
        r.xridx (i) = m.ridx (i);                       \
      }                                                 \
    for (octave_idx_type i = 0; i < nc + 1; i++)        \
      r.xcidx (i) = m.cidx (i);                         \
                                                        \
    r.maybe_compress(true);                             \
    return r;                                           \
  }

#define SPARSE_SSM_BIN_OPS(R1, R2, S, M)        \
  SPARSE_SSM_BIN_OP_1 (R1, operator +, +, S, M) \
  SPARSE_SSM_BIN_OP_1 (R1, operator -, -, S, M) \
  SPARSE_SSM_BIN_OP_2 (R2, operator *, *, S, M) \
  SPARSE_SSM_BIN_OP_2 (R2, operator /, /, S, M)

#define SPARSE_SSM_CMP_OP(F, OP, S, SZ, SC, M, MZ, MC)                  \
  SparseBoolMatrix                                                      \
  F (const S& s, const M& m)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    if (SC (s) OP SC (MZ))                                              \
      {                                                                 \
        r = SparseBoolMatrix (nr, nc, true);                            \
        for (octave_idx_type j = 0; j < nc; j++)                        \
          for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++)   \
            if (! (SC (s) OP MC (m.data (i))))                          \
              r.data (m.ridx (i) + j * nr) = false;                     \
        r.maybe_compress (true);                                        \
      }                                                                 \
    else                                                                \
      {                                                                 \
        r = SparseBoolMatrix (nr, nc, m.nnz ());                        \
        r.cidx (0) = static_cast<octave_idx_type> (0);                  \
        octave_idx_type nel = 0;                                        \
        for (octave_idx_type j = 0; j < nc; j++)                        \
          {                                                             \
            for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
              if (SC (s) OP MC (m.data (i)))                            \
                {                                                       \
                  r.ridx (nel) = m.ridx (i);                            \
                  r.data (nel++) = true;                                \
                }                                                       \
            r.cidx (j + 1) = nel;                                       \
          }                                                             \
        r.maybe_compress (false);                                       \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SSM_CMP_OPS(S, SZ, SC, M, MZ, MC)                \
  SPARSE_SSM_CMP_OP (mx_el_lt, <,  S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_le, <=, S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_ge, >=, S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_gt, >,  S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_eq, ==, S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_ne, !=, S, SZ,   , M, MZ,   )

#define SPARSE_SSM_EQNE_OPS(S, SZ, SC, M, MZ, MC)               \
  SPARSE_SSM_CMP_OP (mx_el_eq, ==, S, SZ,   , M, MZ,   )        \
  SPARSE_SSM_CMP_OP (mx_el_ne, !=, S, SZ,   , M, MZ,   )

#define SPARSE_SSM_BOOL_OP(F, OP, S, M, LHS_ZERO, RHS_ZERO)             \
  SparseBoolMatrix                                                      \
  F (const S& s, const M& m)                                            \
  {                                                                     \
    octave_idx_type nr = m.rows ();                                     \
    octave_idx_type nc = m.cols ();                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    if (nr > 0 && nc > 0)                                               \
      {                                                                 \
        if ((s != LHS_ZERO) OP RHS_ZERO)                                \
          {                                                             \
            r = SparseBoolMatrix (nr, nc, true);                        \
            for (octave_idx_type j = 0; j < nc; j++)                    \
              for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
                if (! ((s != LHS_ZERO) OP (m.data (i) != RHS_ZERO)))    \
                  r.data (m.ridx (i) + j * nr) = false;                 \
            r.maybe_compress (true);                                    \
          }                                                             \
        else                                                            \
          {                                                             \
            r = SparseBoolMatrix (nr, nc, m.nnz ());                    \
            r.cidx (0) = static_cast<octave_idx_type> (0);              \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < nc; j++)                    \
              {                                                         \
                for (octave_idx_type i = m.cidx (j); i < m.cidx (j+1); i++) \
                  if ((s != LHS_ZERO) OP (m.data (i) != RHS_ZERO))      \
                    {                                                   \
                      r.ridx (nel) = m.ridx (i);                        \
                      r.data (nel++) = true;                            \
                    }                                                   \
                r.cidx (j + 1) = nel;                                   \
              }                                                         \
            r.maybe_compress (false);                                   \
          }                                                             \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SSM_BOOL_OPS2(S, M, LHS_ZERO, RHS_ZERO)          \
  SPARSE_SSM_BOOL_OP (mx_el_and, &&, S, M, LHS_ZERO, RHS_ZERO)  \
  SPARSE_SSM_BOOL_OP (mx_el_or,  ||, S, M, LHS_ZERO, RHS_ZERO)

#define SPARSE_SSM_BOOL_OPS(S, M, ZERO)         \
  SPARSE_SSM_BOOL_OPS2(S, M, ZERO, ZERO)

// sparse matrix by sparse matrix operations.

#define SPARSE_SMSM_BIN_OP_1(R, F, OP, M1, M2)                          \
  R                                                                     \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    R r;                                                                \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      {                                                                 \
        if (m1.elem (0,0) == 0.)                                        \
          r = OP R (m2);                                                \
        else                                                            \
          {                                                             \
            r = R (m2_nr, m2_nc, m1.data (0) OP 0.);                    \
                                                                        \
            for (octave_idx_type j = 0 ; j < m2_nc ; j++)               \
              {                                                         \
                octave_quit ();                                         \
                octave_idx_type idxj = j * m2_nr;                       \
                for (octave_idx_type i = m2.cidx (j) ; i < m2.cidx (j+1) ; i++) \
                  {                                                     \
                    octave_quit ();                                     \
                    r.data (idxj + m2.ridx (i)) = m1.data (0) OP m2.data (i); \
                  }                                                     \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m2_nr == 1 && m2_nc == 1)                                  \
      {                                                                 \
        if (m2.elem (0,0) == 0.)                                        \
          r = R (m1);                                                   \
        else                                                            \
          {                                                             \
            r = R (m1_nr, m1_nc, 0. OP m2.data (0));                    \
                                                                        \
            for (octave_idx_type j = 0 ; j < m1_nc ; j++)               \
              {                                                         \
                octave_quit ();                                         \
                octave_idx_type idxj = j * m1_nr;                       \
                for (octave_idx_type i = m1.cidx (j) ; i < m1.cidx (j+1) ; i++) \
                  {                                                     \
                    octave_quit ();                                     \
                    r.data (idxj + m1.ridx (i)) = m1.data (i) OP m2.data (0); \
                  }                                                     \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                          \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);               \
    else                                                                \
      {                                                                 \
        r = R (m1_nr, m1_nc, (m1.nnz () + m2.nnz ()));                  \
                                                                        \
        octave_idx_type jx = 0;                                         \
        r.cidx (0) = 0;                                                 \
        for (octave_idx_type i = 0 ; i < m1_nc ; i++)                   \
          {                                                             \
            octave_idx_type ja = m1.cidx (i);                           \
            octave_idx_type ja_max = m1.cidx (i+1);                     \
            bool ja_lt_max = ja < ja_max;                               \
                                                                        \
            octave_idx_type jb = m2.cidx (i);                           \
            octave_idx_type jb_max = m2.cidx (i+1);                     \
            bool jb_lt_max = jb < jb_max;                               \
                                                                        \
            while (ja_lt_max || jb_lt_max)                              \
              {                                                         \
                octave_quit ();                                         \
                if ((! jb_lt_max) ||                                    \
                    (ja_lt_max && (m1.ridx (ja) < m2.ridx (jb))))       \
                  {                                                     \
                    r.ridx (jx) = m1.ridx (ja);                         \
                    r.data (jx) = m1.data (ja) OP 0.;                   \
                    jx++;                                               \
                    ja++;                                               \
                    ja_lt_max= ja < ja_max;                             \
                  }                                                     \
                else if ((! ja_lt_max) ||                               \
                         (jb_lt_max && (m2.ridx (jb) < m1.ridx (ja))))  \
                  {                                                     \
                    r.ridx (jx) = m2.ridx (jb);                         \
                    r.data (jx) = 0. OP m2.data (jb);                   \
                    jx++;                                               \
                    jb++;                                               \
                    jb_lt_max= jb < jb_max;                             \
                  }                                                     \
                else                                                    \
                  {                                                     \
                    if ((m1.data (ja) OP m2.data (jb)) != 0.)           \
                      {                                                 \
                        r.data (jx) = m1.data (ja) OP m2.data (jb);     \
                        r.ridx (jx) = m1.ridx (ja);                     \
                        jx++;                                           \
                      }                                                 \
                    ja++;                                               \
                    ja_lt_max= ja < ja_max;                             \
                    jb++;                                               \
                    jb_lt_max= jb < jb_max;                             \
                  }                                                     \
              }                                                         \
            r.cidx (i+1) = jx;                                          \
          }                                                             \
                                                                        \
        r.maybe_compress ();                                            \
      }                                                                 \
                                                                        \
    return r;                                                           \
  }

#define SPARSE_SMSM_BIN_OP_2(R, F, OP, M1, M2)                          \
  R                                                                     \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    R r;                                                                \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      {                                                                 \
        if (m1.elem (0,0) == 0.)                                        \
          r = R (m2_nr, m2_nc);                                         \
        else                                                            \
          {                                                             \
            r = R (m2);                                                 \
            octave_idx_type m2_nnz = m2.nnz ();                         \
                                                                        \
            for (octave_idx_type i = 0 ; i < m2_nnz ; i++)              \
              {                                                         \
                octave_quit ();                                         \
                r.data (i) = m1.data (0) OP r.data (i);                 \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m2_nr == 1 && m2_nc == 1)                                  \
      {                                                                 \
        if (m2.elem (0,0) == 0.)                                        \
          r = R (m1_nr, m1_nc);                                         \
        else                                                            \
          {                                                             \
            r = R (m1);                                                 \
            octave_idx_type m1_nnz = m1.nnz ();                         \
                                                                        \
            for (octave_idx_type i = 0 ; i < m1_nnz ; i++)              \
              {                                                         \
                octave_quit ();                                         \
                r.data (i) = r.data (i) OP m2.data (0);                 \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                          \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);               \
    else                                                                \
      {                                                                 \
        r = R (m1_nr, m1_nc, (m1.nnz () > m2.nnz () ? m1.nnz () : m2.nnz ())); \
                                                                        \
        octave_idx_type jx = 0;                                         \
        r.cidx (0) = 0;                                                 \
        for (octave_idx_type i = 0 ; i < m1_nc ; i++)                   \
          {                                                             \
            octave_idx_type ja = m1.cidx (i);                           \
            octave_idx_type ja_max = m1.cidx (i+1);                     \
            bool ja_lt_max = ja < ja_max;                               \
                                                                        \
            octave_idx_type jb = m2.cidx (i);                           \
            octave_idx_type jb_max = m2.cidx (i+1);                     \
            bool jb_lt_max = jb < jb_max;                               \
                                                                        \
            while (ja_lt_max || jb_lt_max)                              \
              {                                                         \
                octave_quit ();                                         \
                if ((! jb_lt_max) ||                                    \
                    (ja_lt_max && (m1.ridx (ja) < m2.ridx (jb))))       \
                  {                                                     \
                    ja++; ja_lt_max= ja < ja_max;                       \
                  }                                                     \
                else if ((! ja_lt_max) ||                               \
                         (jb_lt_max && (m2.ridx (jb) < m1.ridx (ja))))  \
                  {                                                     \
                    jb++; jb_lt_max= jb < jb_max;                       \
                  }                                                     \
                else                                                    \
                  {                                                     \
                    if ((m1.data (ja) OP m2.data (jb)) != 0.)           \
                      {                                                 \
                        r.data (jx) = m1.data (ja) OP m2.data (jb);     \
                        r.ridx (jx) = m1.ridx (ja);                     \
                        jx++;                                           \
                      }                                                 \
                    ja++; ja_lt_max= ja < ja_max;                       \
                    jb++; jb_lt_max= jb < jb_max;                       \
                  }                                                     \
              }                                                         \
            r.cidx (i+1) = jx;                                          \
          }                                                             \
                                                                        \
        r.maybe_compress ();                                            \
      }                                                                 \
                                                                        \
    return r;                                                           \
  }

#define SPARSE_SMSM_BIN_OP_3(R, F, OP, M1, M2)                          \
  R                                                                     \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    R r;                                                                \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      {                                                                 \
        if ((m1.elem (0,0) OP Complex ()) == Complex ())                \
          {                                                             \
            octave_idx_type m2_nnz = m2.nnz ();                         \
            r = R (m2);                                                 \
            for (octave_idx_type i = 0 ; i < m2_nnz ; i++)              \
              r.data (i) = m1.elem (0,0) OP r.data (i);                 \
            r.maybe_compress ();                                        \
          }                                                             \
        else                                                            \
          {                                                             \
            r = R (m2_nr, m2_nc, m1.elem (0,0) OP Complex ());          \
            for (octave_idx_type j = 0 ; j < m2_nc ; j++)               \
              {                                                         \
                octave_quit ();                                         \
                octave_idx_type idxj = j * m2_nr;                       \
                for (octave_idx_type i = m2.cidx (j) ; i < m2.cidx (j+1) ; i++) \
                  {                                                     \
                    octave_quit ();                                     \
                    r.data (idxj + m2.ridx (i)) = m1.elem (0,0) OP m2.data (i); \
                  }                                                     \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m2_nr == 1 && m2_nc == 1)                                  \
      {                                                                 \
        if ((Complex () OP m1.elem (0,0)) == Complex ())                \
          {                                                             \
            octave_idx_type m1_nnz = m1.nnz ();                         \
            r = R (m1);                                                 \
            for (octave_idx_type i = 0 ; i < m1_nnz ; i++)              \
              r.data (i) = r.data (i) OP m2.elem (0,0);                 \
            r.maybe_compress ();                                        \
          }                                                             \
        else                                                            \
          {                                                             \
            r = R (m1_nr, m1_nc, Complex () OP m2.elem (0,0));          \
            for (octave_idx_type j = 0 ; j < m1_nc ; j++)               \
              {                                                         \
                octave_quit ();                                         \
                octave_idx_type idxj = j * m1_nr;                       \
                for (octave_idx_type i = m1.cidx (j) ; i < m1.cidx (j+1) ; i++) \
                  {                                                     \
                    octave_quit ();                                     \
                    r.data (idxj + m1.ridx (i)) = m1.data (i) OP m2.elem (0,0); \
                  }                                                     \
              }                                                         \
            r.maybe_compress ();                                        \
          }                                                             \
      }                                                                 \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                          \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);               \
    else                                                                \
      {                                                                 \
                                                                        \
        /* FIXME: Kludge... Always double/Complex, so Complex () */     \
        r = R (m1_nr, m1_nc, (Complex () OP Complex ()));               \
                                                                        \
        for (octave_idx_type i = 0 ; i < m1_nc ; i++)                   \
          {                                                             \
            octave_idx_type ja = m1.cidx (i);                           \
            octave_idx_type ja_max = m1.cidx (i+1);                     \
            bool ja_lt_max = ja < ja_max;                               \
                                                                        \
            octave_idx_type jb = m2.cidx (i);                           \
            octave_idx_type jb_max = m2.cidx (i+1);                     \
            bool jb_lt_max = jb < jb_max;                               \
                                                                        \
            while (ja_lt_max || jb_lt_max)                              \
              {                                                         \
                octave_quit ();                                         \
                if ((! jb_lt_max) ||                                    \
                    (ja_lt_max && (m1.ridx (ja) < m2.ridx (jb))))       \
                  {                                                     \
                    /* keep those kludges coming */                     \
                    r.elem (m1.ridx (ja),i) = m1.data (ja) OP Complex (); \
                    ja++;                                               \
                    ja_lt_max= ja < ja_max;                             \
                  }                                                     \
                else if ((! ja_lt_max) ||                               \
                         (jb_lt_max && (m2.ridx (jb) < m1.ridx (ja))))  \
                  {                                                     \
                    /* keep those kludges coming */                     \
                    r.elem (m2.ridx (jb),i) = Complex () OP m2.data (jb); \
                    jb++;                                               \
                    jb_lt_max= jb < jb_max;                             \
                  }                                                     \
                else                                                    \
                  {                                                     \
                    r.elem (m1.ridx (ja),i) = m1.data (ja) OP m2.data (jb); \
                    ja++;                                               \
                    ja_lt_max= ja < ja_max;                             \
                    jb++;                                               \
                    jb_lt_max= jb < jb_max;                             \
                  }                                                     \
              }                                                         \
          }                                                             \
        r.maybe_compress (true);                                        \
      }                                                                 \
                                                                        \
    return r;                                                           \
  }

// Note that SM ./ SM needs to take into account the NaN and Inf values
// implied by the division by zero.
// FIXME: Are the NaNs double(NaN) or Complex(NaN,Nan) in the complex case?
#define SPARSE_SMSM_BIN_OPS(R1, R2, M1, M2)             \
  SPARSE_SMSM_BIN_OP_1 (R1, operator +,  +, M1, M2)     \
  SPARSE_SMSM_BIN_OP_1 (R1, operator -,  -, M1, M2)     \
  SPARSE_SMSM_BIN_OP_2 (R2, product,     *, M1, M2)     \
  SPARSE_SMSM_BIN_OP_3 (R2, quotient,    /, M1, M2)

// FIXME: this macro duplicates the bodies of the template functions
// defined in the SPARSE_SSM_CMP_OP and SPARSE_SMS_CMP_OP macros.

#define SPARSE_SMSM_CMP_OP(F, OP, M1, Z1, C1, M2, Z2, C2)               \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      {                                                                 \
        if (C1 (m1.elem (0,0)) OP C2 (Z2))                              \
          {                                                             \
            r = SparseBoolMatrix (m2_nr, m2_nc, true);                  \
            for (octave_idx_type j = 0; j < m2_nc; j++)                 \
              for (octave_idx_type i = m2.cidx (j); i < m2.cidx (j+1); i++) \
                if (! (C1 (m1.elem (0,0)) OP C2 (m2.data (i))))         \
                  r.data (m2.ridx (i) + j * m2_nr) = false;             \
            r.maybe_compress (true);                                    \
          }                                                             \
        else                                                            \
          {                                                             \
            r = SparseBoolMatrix (m2_nr, m2_nc, m2.nnz ());             \
            r.cidx (0) = static_cast<octave_idx_type> (0);              \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m2_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = m2.cidx (j); i < m2.cidx (j+1); i++) \
                  if (C1 (m1.elem (0,0)) OP C2 (m2.data (i)))           \
                    {                                                   \
                      r.ridx (nel) = m2.ridx (i);                       \
                      r.data (nel++) = true;                            \
                    }                                                   \
                r.cidx (j + 1) = nel;                                   \
              }                                                         \
            r.maybe_compress (false);                                   \
          }                                                             \
      }                                                                 \
    else if (m2_nr == 1 && m2_nc == 1)                                  \
      {                                                                 \
        if (C1 (Z1) OP C2 (m2.elem (0,0)))                              \
          {                                                             \
            r = SparseBoolMatrix (m1_nr, m1_nc, true);                  \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              for (octave_idx_type i = m1.cidx (j); i < m1.cidx (j+1); i++) \
                if (! (C1 (m1.data (i)) OP C2 (m2.elem (0,0))))         \
                  r.data (m1.ridx (i) + j * m1_nr) = false;             \
            r.maybe_compress (true);                                    \
          }                                                             \
        else                                                            \
          {                                                             \
            r = SparseBoolMatrix (m1_nr, m1_nc, m1.nnz ());             \
            r.cidx (0) = static_cast<octave_idx_type> (0);              \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = m1.cidx (j); i < m1.cidx (j+1); i++) \
                  if (C1 (m1.data (i)) OP C2 (m2.elem (0,0)))           \
                    {                                                   \
                      r.ridx (nel) = m1.ridx (i);                       \
                      r.data (nel++) = true;                            \
                    }                                                   \
                r.cidx (j + 1) = nel;                                   \
              }                                                         \
            r.maybe_compress (false);                                   \
          }                                                             \
      }                                                                 \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            if (C1 (Z1) OP C2 (Z2))                                     \
              {                                                         \
                r = SparseBoolMatrix (m1_nr, m1_nc, true);              \
                for (octave_idx_type j = 0; j < m1_nc; j++)             \
                  {                                                     \
                    octave_idx_type i1 = m1.cidx (j);                   \
                    octave_idx_type e1 = m1.cidx (j+1);                 \
                    octave_idx_type i2 = m2.cidx (j);                   \
                    octave_idx_type e2 = m2.cidx (j+1);                 \
                    while (i1 < e1 || i2 < e2)                          \
                      {                                                 \
                        if (i1 == e1 || (i2 < e2 && m1.ridx (i1) > m2.ridx (i2))) \
                          {                                             \
                            if (! (C1 (Z1) OP C2 (m2.data (i2))))       \
                              r.data (m2.ridx (i2) + j * m1_nr) = false; \
                            i2++;                                       \
                          }                                             \
                        else if (i2 == e2 || m1.ridx (i1) < m2.ridx (i2)) \
                          {                                             \
                            if (! (C1 (m1.data (i1)) OP C2 (Z2)))       \
                              r.data (m1.ridx (i1) + j * m1_nr) = false; \
                            i1++;                                       \
                          }                                             \
                        else                                            \
                          {                                             \
                            if (! (C1 (m1.data (i1)) OP C2 (m2.data (i2)))) \
                              r.data (m1.ridx (i1) + j * m1_nr) = false; \
                            i1++;                                       \
                            i2++;                                       \
                          }                                             \
                      }                                                 \
                  }                                                     \
                r.maybe_compress (true);                                \
              }                                                         \
            else                                                        \
              {                                                         \
                r = SparseBoolMatrix (m1_nr, m1_nc, m1.nnz () + m2.nnz ()); \
                r.cidx (0) = static_cast<octave_idx_type> (0);          \
                octave_idx_type nel = 0;                                \
                for (octave_idx_type j = 0; j < m1_nc; j++)             \
                  {                                                     \
                    octave_idx_type i1 = m1.cidx (j);                   \
                    octave_idx_type e1 = m1.cidx (j+1);                 \
                    octave_idx_type i2 = m2.cidx (j);                   \
                    octave_idx_type e2 = m2.cidx (j+1);                 \
                    while (i1 < e1 || i2 < e2)                          \
                      {                                                 \
                        if (i1 == e1 || (i2 < e2 && m1.ridx (i1) > m2.ridx (i2))) \
                          {                                             \
                            if (C1 (Z1) OP C2 (m2.data (i2)))           \
                              {                                         \
                                r.ridx (nel) = m2.ridx (i2);            \
                                r.data (nel++) = true;                  \
                              }                                         \
                            i2++;                                       \
                          }                                             \
                        else if (i2 == e2 || m1.ridx (i1) < m2.ridx (i2)) \
                          {                                             \
                            if (C1 (m1.data (i1)) OP C2 (Z2))           \
                              {                                         \
                                r.ridx (nel) = m1.ridx (i1);            \
                                r.data (nel++) = true;                  \
                              }                                         \
                            i1++;                                       \
                          }                                             \
                        else                                            \
                          {                                             \
                            if (C1 (m1.data (i1)) OP C2 (m2.data (i2))) \
                              {                                         \
                                r.ridx (nel) = m1.ridx (i1);            \
                                r.data (nel++) = true;                  \
                              }                                         \
                            i1++;                                       \
                            i2++;                                       \
                          }                                             \
                      }                                                 \
                    r.cidx (j + 1) = nel;                               \
                  }                                                     \
                r.maybe_compress (false);                               \
              }                                                         \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMSM_CMP_OPS(M1, Z1, C1, M2, Z2, C2)             \
  SPARSE_SMSM_CMP_OP (mx_el_lt, <,  M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_le, <=, M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_ge, >=, M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_gt, >,  M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_eq, ==, M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_ne, !=, M1, Z1,   , M2, Z2,   )

#define SPARSE_SMSM_EQNE_OPS(M1, Z1, C1, M2, Z2, C2)            \
  SPARSE_SMSM_CMP_OP (mx_el_eq, ==, M1, Z1,   , M2, Z2,   )     \
  SPARSE_SMSM_CMP_OP (mx_el_ne, !=, M1, Z1,   , M2, Z2,   )

// FIXME: this macro duplicates the bodies of the template functions
// defined in the SPARSE_SSM_BOOL_OP and SPARSE_SMS_BOOL_OP macros.

#define SPARSE_SMSM_BOOL_OP(F, OP, M1, M2, LHS_ZERO, RHS_ZERO)          \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      {                                                                 \
        if (m2_nr > 0 && m2_nc > 0)                                     \
          {                                                             \
            if ((m1.elem (0,0) != LHS_ZERO) OP RHS_ZERO)                \
              {                                                         \
                r = SparseBoolMatrix (m2_nr, m2_nc, true);              \
                for (octave_idx_type j = 0; j < m2_nc; j++)             \
                  for (octave_idx_type i = m2.cidx (j); i < m2.cidx (j+1); i++) \
                    if (! ((m1.elem (0,0) != LHS_ZERO) OP (m2.data (i) != RHS_ZERO))) \
                      r.data (m2.ridx (i) + j * m2_nr) = false;         \
                r.maybe_compress (true);                                \
              }                                                         \
            else                                                        \
              {                                                         \
                r = SparseBoolMatrix (m2_nr, m2_nc, m2.nnz ());         \
                r.cidx (0) = static_cast<octave_idx_type> (0);          \
                octave_idx_type nel = 0;                                \
                for (octave_idx_type j = 0; j < m2_nc; j++)             \
                  {                                                     \
                    for (octave_idx_type i = m2.cidx (j); i < m2.cidx (j+1); i++) \
                      if ((m1.elem (0,0) != LHS_ZERO) OP (m2.data (i) != RHS_ZERO)) \
                        {                                               \
                          r.ridx (nel) = m2.ridx (i);                   \
                          r.data (nel++) = true;                        \
                        }                                               \
                    r.cidx (j + 1) = nel;                               \
                  }                                                     \
                r.maybe_compress (false);                               \
              }                                                         \
          }                                                             \
      }                                                                 \
    else if (m2_nr == 1 && m2_nc == 1)                                  \
      {                                                                 \
        if (m1_nr > 0 && m1_nc > 0)                                     \
          {                                                             \
            if (LHS_ZERO OP (m2.elem (0,0) != RHS_ZERO))                \
              {                                                         \
                r = SparseBoolMatrix (m1_nr, m1_nc, true);              \
                for (octave_idx_type j = 0; j < m1_nc; j++)             \
                  for (octave_idx_type i = m1.cidx (j); i < m1.cidx (j+1); i++) \
                    if (! ((m1.data (i) != LHS_ZERO) OP (m2.elem (0,0) != RHS_ZERO))) \
                      r.data (m1.ridx (i) + j * m1_nr) = false;         \
                r.maybe_compress (true);                                \
              }                                                         \
            else                                                        \
              {                                                         \
                r = SparseBoolMatrix (m1_nr, m1_nc, m1.nnz ());         \
                r.cidx (0) = static_cast<octave_idx_type> (0);          \
                octave_idx_type nel = 0;                                \
                for (octave_idx_type j = 0; j < m1_nc; j++)             \
                  {                                                     \
                    for (octave_idx_type i = m1.cidx (j); i < m1.cidx (j+1); i++) \
                      if ((m1.data (i) != LHS_ZERO) OP (m2.elem (0,0) != RHS_ZERO)) \
                        {                                               \
                          r.ridx (nel) = m1.ridx (i);                   \
                          r.data (nel++) = true;                        \
                        }                                               \
                    r.cidx (j + 1) = nel;                               \
                  }                                                     \
                r.maybe_compress (false);                               \
              }                                                         \
          }                                                             \
      }                                                                 \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            r = SparseBoolMatrix (m1_nr, m1_nc, m1.nnz () + m2.nnz ()); \
            r.cidx (0) = static_cast<octave_idx_type> (0);              \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                octave_idx_type i1 = m1.cidx (j);                       \
                octave_idx_type e1 = m1.cidx (j+1);                     \
                octave_idx_type i2 = m2.cidx (j);                       \
                octave_idx_type e2 = m2.cidx (j+1);                     \
                while (i1 < e1 || i2 < e2)                              \
                  {                                                     \
                    if (i1 == e1 || (i2 < e2 && m1.ridx (i1) > m2.ridx (i2))) \
                      {                                                 \
                        if (LHS_ZERO OP m2.data (i2) != RHS_ZERO)       \
                          {                                             \
                            r.ridx (nel) = m2.ridx (i2);                \
                            r.data (nel++) = true;                      \
                          }                                             \
                        i2++;                                           \
                      }                                                 \
                    else if (i2 == e2 || m1.ridx (i1) < m2.ridx (i2))   \
                      {                                                 \
                        if (m1.data (i1) != LHS_ZERO OP RHS_ZERO)       \
                          {                                             \
                            r.ridx (nel) = m1.ridx (i1);                \
                            r.data (nel++) = true;                      \
                          }                                             \
                        i1++;                                           \
                      }                                                 \
                    else                                                \
                      {                                                 \
                        if (m1.data (i1) != LHS_ZERO OP m2.data (i2) != RHS_ZERO) \
                          {                                             \
                            r.ridx (nel) = m1.ridx (i1);                \
                            r.data (nel++) = true;                      \
                          }                                             \
                        i1++;                                           \
                        i2++;                                           \
                      }                                                 \
                  }                                                     \
                r.cidx (j + 1) = nel;                                   \
              }                                                         \
            r.maybe_compress (false);                                   \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMSM_BOOL_OPS2(M1, M2, LHS_ZERO, RHS_ZERO)               \
  SPARSE_SMSM_BOOL_OP (mx_el_and, &&, M1, M2, LHS_ZERO, RHS_ZERO)       \
  SPARSE_SMSM_BOOL_OP (mx_el_or,  ||, M1, M2, LHS_ZERO, RHS_ZERO)

#define SPARSE_SMSM_BOOL_OPS(M1, M2, ZERO)      \
  SPARSE_SMSM_BOOL_OPS2(M1, M2, ZERO, ZERO)

// matrix by sparse matrix operations.

#define SPARSE_MSM_BIN_OP_1(R, F, OP, M1, M2)                   \
  R                                                             \
  F (const M1& m1, const M2& m2)                                \
  {                                                             \
    R r;                                                        \
                                                                \
    octave_idx_type m1_nr = m1.rows ();                         \
    octave_idx_type m1_nc = m1.cols ();                         \
                                                                \
    octave_idx_type m2_nr = m2.rows ();                         \
    octave_idx_type m2_nc = m2.cols ();                         \
                                                                \
    if (m2_nr == 1 && m2_nc == 1)                               \
      r = R (m1 OP m2.elem (0,0));                              \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                  \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);       \
    else                                                        \
      {                                                         \
        r = R (F (m1, m2.matrix_value ()));                     \
      }                                                         \
    return r;                                                   \
  }

#define SPARSE_MSM_BIN_OP_2(R, F, OP, M1, M2)                           \
  R                                                                     \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    R r;                                                                \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m2_nr == 1 && m2_nc == 1)                                       \
      r = R (m1 OP m2.elem (0,0));                                      \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                          \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);               \
    else                                                                \
      {                                                                 \
        if (do_mx_check (m1, mx_inline_all_finite<M1::element_type>))   \
          {                                                             \
            /* Sparsity pattern is preserved. */                        \
            octave_idx_type m2_nz = m2.nnz ();                          \
            r = R (m2_nr, m2_nc, m2_nz);                                \
            for (octave_idx_type j = 0, k = 0; j < m2_nc; j++)          \
              {                                                         \
                octave_quit ();                                         \
                for (octave_idx_type i = m2.cidx (j); i < m2.cidx (j+1); i++) \
                  {                                                     \
                    octave_idx_type mri = m2.ridx (i);                  \
                    R::element_type x = m1(mri, j) OP m2.data (i);      \
                    if (x != 0.0)                                       \
                      {                                                 \
                        r.xdata (k) = x;                                \
                        r.xridx (k) = m2.ridx (i);                      \
                        k++;                                            \
                      }                                                 \
                  }                                                     \
                r.xcidx (j+1) = k;                                      \
              }                                                         \
            r.maybe_compress (false);                                   \
            return r;                                                   \
          }                                                             \
        else                                                            \
          r = R (F (m1, m2.matrix_value ()));                           \
      }                                                                 \
                                                                        \
    return r;                                                           \
  }

// FIXME: Pass a specific ZERO value
#define SPARSE_MSM_BIN_OPS(R1, R2, M1, M2)              \
  SPARSE_MSM_BIN_OP_1 (R1, operator +,  +, M1, M2)      \
  SPARSE_MSM_BIN_OP_1 (R1, operator -,  -, M1, M2)      \
  SPARSE_MSM_BIN_OP_2 (R2, product,     *, M1, M2)      \
  SPARSE_MSM_BIN_OP_1 (R2, quotient,    /, M1, M2)

#define SPARSE_MSM_CMP_OP(F, OP, M1, C1, M2, C2)                        \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m2_nr == 1 && m2_nc == 1)                                       \
      r = SparseBoolMatrix (F (m1, m2.elem (0,0)));                     \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            /* Count num of nonzero elements */                         \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              for (octave_idx_type i = 0; i < m1_nr; i++)               \
                if (C1 (m1.elem (i, j)) OP C2 (m2.elem (i, j)))         \
                  nel++;                                                \
                                                                        \
            r = SparseBoolMatrix (m1_nr, m1_nc, nel);                   \
                                                                        \
            octave_idx_type ii = 0;                                     \
            r.cidx (0) = 0;                                             \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = 0; i < m1_nr; i++)             \
                  {                                                     \
                    bool el = C1 (m1.elem (i, j)) OP C2 (m2.elem (i, j)); \
                    if (el)                                             \
                      {                                                 \
                        r.data (ii) = el;                               \
                        r.ridx (ii++) = i;                              \
                      }                                                 \
                  }                                                     \
                r.cidx (j+1) = ii;                                      \
              }                                                         \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_MSM_CMP_OPS(M1, Z1, C1, M2, Z2, C2)      \
  SPARSE_MSM_CMP_OP (mx_el_lt, <,  M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_le, <=, M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_ge, >=, M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_gt, >,  M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_eq, ==, M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_ne, !=, M1,   , M2,   )

#define SPARSE_MSM_EQNE_OPS(M1, Z1, C1, M2, Z2, C2)     \
  SPARSE_MSM_CMP_OP (mx_el_eq, ==, M1,   , M2,   )      \
  SPARSE_MSM_CMP_OP (mx_el_ne, !=, M1,   , M2,   )

#define SPARSE_MSM_BOOL_OP(F, OP, M1, M2, LHS_ZERO, RHS_ZERO)           \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m2_nr == 1 && m2_nc == 1)                                       \
      r = SparseBoolMatrix (F (m1, m2.elem (0,0)));                     \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            /* Count num of nonzero elements */                         \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              for (octave_idx_type i = 0; i < m1_nr; i++)               \
                if ((m1.elem (i, j) != LHS_ZERO)                        \
                    OP (m2.elem (i, j) != RHS_ZERO))                    \
                  nel++;                                                \
                                                                        \
            r = SparseBoolMatrix (m1_nr, m1_nc, nel);                   \
                                                                        \
            octave_idx_type ii = 0;                                     \
            r.cidx (0) = 0;                                             \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = 0; i < m1_nr; i++)             \
                  {                                                     \
                    bool el = (m1.elem (i, j) != LHS_ZERO)              \
                      OP (m2.elem (i, j) != RHS_ZERO);                  \
                    if (el)                                             \
                      {                                                 \
                        r.data (ii) = el;                               \
                        r.ridx (ii++) = i;                              \
                      }                                                 \
                  }                                                     \
                r.cidx (j+1) = ii;                                      \
              }                                                         \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_MSM_BOOL_OPS2(M1, M2, LHS_ZERO, RHS_ZERO)                \
  SPARSE_MSM_BOOL_OP (mx_el_and, &&, M1, M2, LHS_ZERO, RHS_ZERO)        \
  SPARSE_MSM_BOOL_OP (mx_el_or,  ||, M1, M2, LHS_ZERO, RHS_ZERO)

#define SPARSE_MSM_BOOL_OPS(M1, M2, ZERO)       \
  SPARSE_MSM_BOOL_OPS2(M1, M2, ZERO, ZERO)

// sparse matrix by matrix operations.

#define SPARSE_SMM_BIN_OP_1(R, F, OP, M1, M2)                   \
  R                                                             \
  F (const M1& m1, const M2& m2)                                \
  {                                                             \
    R r;                                                        \
                                                                \
    octave_idx_type m1_nr = m1.rows ();                         \
    octave_idx_type m1_nc = m1.cols ();                         \
                                                                \
    octave_idx_type m2_nr = m2.rows ();                         \
    octave_idx_type m2_nc = m2.cols ();                         \
                                                                \
    if (m1_nr == 1 && m1_nc == 1)                               \
      r = R (m1.elem (0,0) OP m2);                              \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                  \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);       \
    else                                                        \
      {                                                         \
        r = R (m1.matrix_value () OP m2);                       \
      }                                                         \
    return r;                                                   \
  }

// sm .* m preserves sparsity if m contains no Infs nor Nans.
#define SPARSE_SMM_BIN_OP_2_CHECK_product(ET)   \
  do_mx_check (m2, mx_inline_all_finite<ET>)

// sm ./ m preserves sparsity if m contains no NaNs or zeros.
#define SPARSE_SMM_BIN_OP_2_CHECK_quotient(ET)                          \
  ! do_mx_check (m2, mx_inline_any_nan<ET>) && m2.nnz () == m2.numel ()

#define SPARSE_SMM_BIN_OP_2(R, F, OP, M1, M2)                           \
  R                                                                     \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    R r;                                                                \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      r = R (m1.elem (0,0) OP m2);                                      \
    else if (m1_nr != m2_nr || m1_nc != m2_nc)                          \
      octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);               \
    else                                                                \
      {                                                                 \
        if (SPARSE_SMM_BIN_OP_2_CHECK_ ## F(M2::element_type))          \
          {                                                             \
            /* Sparsity pattern is preserved. */                        \
            octave_idx_type m1_nz = m1.nnz ();                          \
            r = R (m1_nr, m1_nc, m1_nz);                                \
            for (octave_idx_type j = 0, k = 0; j < m1_nc; j++)          \
              {                                                         \
                octave_quit ();                                         \
                for (octave_idx_type i = m1.cidx (j); i < m1.cidx (j+1); i++) \
                  {                                                     \
                    octave_idx_type mri = m1.ridx (i);                  \
                    R::element_type x = m1.data (i) OP m2 (mri, j);     \
                    if (x != 0.0)                                       \
                      {                                                 \
                        r.xdata (k) = x;                                \
                        r.xridx (k) = m1.ridx (i);                      \
                        k++;                                            \
                      }                                                 \
                  }                                                     \
                r.xcidx (j+1) = k;                                      \
              }                                                         \
            r.maybe_compress (false);                                   \
            return r;                                                   \
          }                                                             \
        else                                                            \
          r = R (F (m1.matrix_value (), m2));                           \
      }                                                                 \
                                                                        \
    return r;                                                           \
  }

#define SPARSE_SMM_BIN_OPS(R1, R2, M1, M2)              \
  SPARSE_SMM_BIN_OP_1 (R1, operator +,  +, M1, M2)      \
  SPARSE_SMM_BIN_OP_1 (R1, operator -,  -, M1, M2)      \
  SPARSE_SMM_BIN_OP_2 (R2, product,     *, M1, M2)      \
  SPARSE_SMM_BIN_OP_2 (R2, quotient,    /, M1, M2)

#define SPARSE_SMM_CMP_OP(F, OP, M1, C1, M2, C2)                        \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      r = SparseBoolMatrix (F (m1.elem (0,0), m2));                     \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            /* Count num of nonzero elements */                         \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              for (octave_idx_type i = 0; i < m1_nr; i++)               \
                if (C1 (m1.elem (i, j)) OP C2 (m2.elem (i, j)))         \
                  nel++;                                                \
                                                                        \
            r = SparseBoolMatrix (m1_nr, m1_nc, nel);                   \
                                                                        \
            octave_idx_type ii = 0;                                     \
            r.cidx (0) = 0;                                             \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = 0; i < m1_nr; i++)             \
                  {                                                     \
                    bool el = C1 (m1.elem (i, j)) OP C2 (m2.elem (i, j)); \
                    if (el)                                             \
                      {                                                 \
                        r.data (ii) = el;                               \
                        r.ridx (ii++) = i;                              \
                      }                                                 \
                  }                                                     \
                r.cidx (j+1) = ii;                                      \
              }                                                         \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMM_CMP_OPS(M1, Z1, C1, M2, Z2, C2)      \
  SPARSE_SMM_CMP_OP (mx_el_lt, <,  M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_le, <=, M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_ge, >=, M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_gt, >,  M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_eq, ==, M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_ne, !=, M1,   , M2,   )

#define SPARSE_SMM_EQNE_OPS(M1, Z1, C1, M2, Z2, C2)     \
  SPARSE_SMM_CMP_OP (mx_el_eq, ==, M1,   , M2,   )      \
  SPARSE_SMM_CMP_OP (mx_el_ne, !=, M1,   , M2,   )

#define SPARSE_SMM_BOOL_OP(F, OP, M1, M2, LHS_ZERO, RHS_ZERO)           \
  SparseBoolMatrix                                                      \
  F (const M1& m1, const M2& m2)                                        \
  {                                                                     \
    SparseBoolMatrix r;                                                 \
                                                                        \
    octave_idx_type m1_nr = m1.rows ();                                 \
    octave_idx_type m1_nc = m1.cols ();                                 \
                                                                        \
    octave_idx_type m2_nr = m2.rows ();                                 \
    octave_idx_type m2_nc = m2.cols ();                                 \
                                                                        \
    if (m1_nr == 1 && m1_nc == 1)                                       \
      r = SparseBoolMatrix (F (m1.elem (0,0), m2));                     \
    else if (m1_nr == m2_nr && m1_nc == m2_nc)                          \
      {                                                                 \
        if (m1_nr != 0 || m1_nc != 0)                                   \
          {                                                             \
            /* Count num of nonzero elements */                         \
            octave_idx_type nel = 0;                                    \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              for (octave_idx_type i = 0; i < m1_nr; i++)               \
                if ((m1.elem (i, j) != LHS_ZERO)                        \
                    OP (m2.elem (i, j) != RHS_ZERO))                    \
                  nel++;                                                \
                                                                        \
            r = SparseBoolMatrix (m1_nr, m1_nc, nel);                   \
                                                                        \
            octave_idx_type ii = 0;                                     \
            r.cidx (0) = 0;                                             \
            for (octave_idx_type j = 0; j < m1_nc; j++)                 \
              {                                                         \
                for (octave_idx_type i = 0; i < m1_nr; i++)             \
                  {                                                     \
                    bool el = (m1.elem (i, j) != LHS_ZERO)              \
                      OP (m2.elem (i, j) != RHS_ZERO);                  \
                    if (el)                                             \
                      {                                                 \
                        r.data (ii) = el;                               \
                        r.ridx (ii++) = i;                              \
                      }                                                 \
                  }                                                     \
                r.cidx (j+1) = ii;                                      \
              }                                                         \
          }                                                             \
      }                                                                 \
    else                                                                \
      {                                                                 \
        if ((m1_nr != 0 || m1_nc != 0) && (m2_nr != 0 || m2_nc != 0))   \
          octave::err_nonconformant (#F, m1_nr, m1_nc, m2_nr, m2_nc);           \
      }                                                                 \
    return r;                                                           \
  }

#define SPARSE_SMM_BOOL_OPS2(M1, M2, LHS_ZERO, RHS_ZERO)                \
  SPARSE_SMM_BOOL_OP (mx_el_and, &&, M1, M2, LHS_ZERO, RHS_ZERO)        \
  SPARSE_SMM_BOOL_OP (mx_el_or,  ||, M1, M2, LHS_ZERO, RHS_ZERO)

#define SPARSE_SMM_BOOL_OPS(M1, M2, ZERO)       \
  SPARSE_SMM_BOOL_OPS2(M1, M2, ZERO, ZERO)

// Avoid some code duplication.  Maybe we should use templates.

#define SPARSE_CUMSUM(RET_TYPE, ELT_TYPE, FCN)                          \
                                                                        \
  octave_idx_type nr = rows ();                                         \
  octave_idx_type nc = cols ();                                         \
                                                                        \
  RET_TYPE retval;                                                      \
                                                                        \
  if (nr > 0 && nc > 0)                                                 \
    {                                                                   \
      if ((nr == 1 && dim == -1) || dim == 1)                           \
        /* Ugly!! Is there a better way? */                             \
        retval = transpose (). FCN (0) .transpose ();                   \
      else                                                              \
        {                                                               \
          octave_idx_type nel = 0;                                      \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            {                                                           \
              ELT_TYPE t = ELT_TYPE ();                                 \
              for (octave_idx_type j = cidx (i); j < cidx (i+1); j++)   \
                {                                                       \
                  t += data (j);                                        \
                  if (t != ELT_TYPE ())                                 \
                    {                                                   \
                      if (j == cidx (i+1) - 1)                          \
                        nel += nr - ridx (j);                           \
                      else                                              \
                        nel += ridx (j+1) - ridx (j);                   \
                    }                                                   \
                }                                                       \
            }                                                           \
          retval = RET_TYPE (nr, nc, nel);                              \
          retval.cidx (0) = 0;                                          \
          octave_idx_type ii = 0;                                       \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            {                                                           \
              ELT_TYPE t = ELT_TYPE ();                                 \
              for (octave_idx_type j = cidx (i); j < cidx (i+1); j++)   \
                {                                                       \
                  t += data (j);                                        \
                  if (t != ELT_TYPE ())                                 \
                    {                                                   \
                      if (j == cidx (i+1) - 1)                          \
                        {                                               \
                          for (octave_idx_type k = ridx (j); k < nr; k++) \
                            {                                           \
                              retval.data (ii) = t;                     \
                              retval.ridx (ii++) = k;                   \
                            }                                           \
                        }                                               \
                      else                                              \
                        {                                               \
                          for (octave_idx_type k = ridx (j); k < ridx (j+1); k++) \
                            {                                           \
                              retval.data (ii) = t;                     \
                              retval.ridx (ii++) = k;                   \
                            }                                           \
                        }                                               \
                    }                                                   \
                }                                                       \
              retval.cidx (i+1) = ii;                                   \
            }                                                           \
        }                                                               \
    }                                                                   \
  else                                                                  \
    retval = RET_TYPE (nr,nc);                                          \
                                                                        \
  return retval

#define SPARSE_CUMPROD(RET_TYPE, ELT_TYPE, FCN)                         \
                                                                        \
  octave_idx_type nr = rows ();                                         \
  octave_idx_type nc = cols ();                                         \
                                                                        \
  RET_TYPE retval;                                                      \
                                                                        \
  if (nr > 0 && nc > 0)                                                 \
    {                                                                   \
      if ((nr == 1 && dim == -1) || dim == 1)                           \
        /* Ugly!! Is there a better way? */                             \
        retval = transpose (). FCN (0) .transpose ();                   \
      else                                                              \
        {                                                               \
          octave_idx_type nel = 0;                                      \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            {                                                           \
              octave_idx_type jj = 0;                                   \
              for (octave_idx_type j = cidx (i); j < cidx (i+1); j++)   \
                {                                                       \
                  if (jj == ridx (j))                                   \
                    {                                                   \
                      nel++;                                            \
                      jj++;                                             \
                    }                                                   \
                  else                                                  \
                    break;                                              \
                }                                                       \
            }                                                           \
          retval = RET_TYPE (nr, nc, nel);                              \
          retval.cidx (0) = 0;                                          \
          octave_idx_type ii = 0;                                       \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            {                                                           \
              ELT_TYPE t = ELT_TYPE (1.);                               \
              octave_idx_type jj = 0;                                   \
              for (octave_idx_type j = cidx (i); j < cidx (i+1); j++)   \
                {                                                       \
                  if (jj == ridx (j))                                   \
                    {                                                   \
                      t *= data (j);                                    \
                      retval.data (ii) = t;                             \
                      retval.ridx (ii++) = jj++;                        \
                    }                                                   \
                  else                                                  \
                    break;                                              \
                }                                                       \
              retval.cidx (i+1) = ii;                                   \
            }                                                           \
        }                                                               \
    }                                                                   \
  else                                                                  \
    retval = RET_TYPE (nr,nc);                                          \
                                                                        \
  return retval

#define SPARSE_BASE_REDUCTION_OP(RET_TYPE, EL_TYPE, ROW_EXPR, COL_EXPR, \
                                 INIT_VAL, MT_RESULT)                   \
                                                                        \
  octave_idx_type nr = rows ();                                         \
  octave_idx_type nc = cols ();                                         \
                                                                        \
  RET_TYPE retval;                                                      \
                                                                        \
  if (nr > 0 && nc > 0)                                                 \
    {                                                                   \
      if ((nr == 1 && dim == -1) || dim == 1)                           \
        {                                                               \
          /* Define j here to allow fancy definition for prod method */ \
          octave_idx_type j = 0;                                        \
          OCTAVE_LOCAL_BUFFER (EL_TYPE, tmp, nr);                       \
                                                                        \
          for (octave_idx_type i = 0; i < nr; i++)                      \
            tmp[i] = INIT_VAL;                                          \
          for (j = 0; j < nc; j++)                                      \
            {                                                           \
              for (octave_idx_type i = cidx (j); i < cidx (j + 1); i++) \
                {                                                       \
                  ROW_EXPR;                                             \
                }                                                       \
            }                                                           \
          octave_idx_type nel = 0;                                      \
          for (octave_idx_type i = 0; i < nr; i++)                      \
            if (tmp[i] != EL_TYPE ())                                   \
              nel++;                                                    \
          retval = RET_TYPE (nr, static_cast<octave_idx_type> (1), nel); \
          retval.cidx (0) = 0;                                          \
          retval.cidx (1) = nel;                                        \
          nel = 0;                                                      \
          for (octave_idx_type i = 0; i < nr; i++)                      \
            if (tmp[i] != EL_TYPE ())                                   \
              {                                                         \
                retval.data (nel) = tmp[i];                             \
                retval.ridx (nel++) = i;                                \
              }                                                         \
        }                                                               \
      else                                                              \
        {                                                               \
          OCTAVE_LOCAL_BUFFER (EL_TYPE, tmp, nc);                       \
                                                                        \
          for (octave_idx_type j = 0; j < nc; j++)                      \
            {                                                           \
              tmp[j] = INIT_VAL;                                        \
              for (octave_idx_type i = cidx (j); i < cidx (j + 1); i++) \
                {                                                       \
                  COL_EXPR;                                             \
                }                                                       \
            }                                                           \
          octave_idx_type nel = 0;                                      \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            if (tmp[i] != EL_TYPE ())                                   \
              nel++;                                                    \
          retval = RET_TYPE (static_cast<octave_idx_type> (1), nc, nel); \
          retval.cidx (0) = 0;                                          \
          nel = 0;                                                      \
          for (octave_idx_type i = 0; i < nc; i++)                      \
            if (tmp[i] != EL_TYPE ())                                   \
              {                                                         \
                retval.data (nel) = tmp[i];                             \
                retval.ridx (nel++) = 0;                                \
                retval.cidx (i+1) = retval.cidx (i) + 1;                \
              }                                                         \
            else                                                        \
              retval.cidx (i+1) = retval.cidx (i);                      \
        }                                                               \
    }                                                                   \
  else if (nc == 0 && (nr == 0 || (nr == 1 && dim == -1)))              \
    {                                                                   \
      if (MT_RESULT)                                                    \
        {                                                               \
          retval = RET_TYPE (static_cast<octave_idx_type> (1),          \
                             static_cast<octave_idx_type> (1),          \
                             static_cast<octave_idx_type> (1));         \
          retval.cidx (0) = 0;                                          \
          retval.cidx (1) = 1;                                          \
          retval.ridx (0) = 0;                                          \
          retval.data (0) = MT_RESULT;                                  \
        }                                                               \
      else                                                              \
        retval = RET_TYPE (static_cast<octave_idx_type> (1),            \
                           static_cast<octave_idx_type> (1),            \
                           static_cast<octave_idx_type> (0));           \
    }                                                                   \
  else if (nr == 0 && (dim == 0 || dim == -1))                          \
    {                                                                   \
      if (MT_RESULT)                                                    \
        {                                                               \
          retval = RET_TYPE (static_cast<octave_idx_type> (1), nc, nc); \
          retval.cidx (0) = 0;                                          \
          for (octave_idx_type i = 0; i < nc ; i++)                     \
            {                                                           \
              retval.ridx (i) = 0;                                      \
              retval.cidx (i+1) = i+1;                                  \
              retval.data (i) = MT_RESULT;                              \
            }                                                           \
        }                                                               \
      else                                                              \
        retval = RET_TYPE (static_cast<octave_idx_type> (1), nc,        \
                           static_cast<octave_idx_type> (0));           \
    }                                                                   \
  else if (nc == 0 && dim == 1)                                         \
    {                                                                   \
      if (MT_RESULT)                                                    \
        {                                                               \
          retval = RET_TYPE (nr, static_cast<octave_idx_type> (1), nr); \
          retval.cidx (0) = 0;                                          \
          retval.cidx (1) = nr;                                         \
          for (octave_idx_type i = 0; i < nr; i++)                      \
            {                                                           \
              retval.ridx (i) = i;                                      \
              retval.data (i) = MT_RESULT;                              \
            }                                                           \
        }                                                               \
      else                                                              \
        retval = RET_TYPE (nr, static_cast<octave_idx_type> (1),        \
                           static_cast<octave_idx_type> (0));           \
    }                                                                   \
  else                                                                  \
    retval.resize (nr > 0, nc > 0);                                     \
                                                                        \
  return retval

#define SPARSE_REDUCTION_OP_ROW_EXPR(OP)        \
  tmp[ridx (i)] OP data (i)

#define SPARSE_REDUCTION_OP_COL_EXPR(OP)        \
  tmp[j] OP data (i)

#define SPARSE_REDUCTION_OP(RET_TYPE, EL_TYPE, OP, INIT_VAL, MT_RESULT) \
  SPARSE_BASE_REDUCTION_OP (RET_TYPE, EL_TYPE,                          \
                            SPARSE_REDUCTION_OP_ROW_EXPR (OP),          \
                            SPARSE_REDUCTION_OP_COL_EXPR (OP),          \
                            INIT_VAL, MT_RESULT)

// Don't break from this loop if the test succeeds because
// we are looping over the rows and not the columns in the inner loop.
#define SPARSE_ANY_ALL_OP_ROW_CODE(TEST_OP, TEST_TRUE_VAL)      \
  if (data (i) TEST_OP 0.0)                                     \
    tmp[ridx (i)] = TEST_TRUE_VAL;

#define SPARSE_ANY_ALL_OP_COL_CODE(TEST_OP, TEST_TRUE_VAL)      \
  if (data (i) TEST_OP 0.0)                                     \
    {                                                           \
      tmp[j] = TEST_TRUE_VAL;                                   \
      break;                                                    \
    }

#define SPARSE_ANY_ALL_OP(DIM, INIT_VAL, MT_RESULT, TEST_OP, TEST_TRUE_VAL) \
  SPARSE_BASE_REDUCTION_OP (SparseBoolMatrix, char,                     \
                            SPARSE_ANY_ALL_OP_ROW_CODE (TEST_OP, TEST_TRUE_VAL), \
                            SPARSE_ANY_ALL_OP_COL_CODE (TEST_OP, TEST_TRUE_VAL), \
                            INIT_VAL, MT_RESULT)

#define SPARSE_ALL_OP(DIM)                                              \
  if ((rows () == 1 && dim == -1) || dim == 1)                          \
    return transpose (). all (0). transpose ();                         \
  else                                                                  \
    {                                                                   \
      SPARSE_ANY_ALL_OP (DIM, (cidx (j+1) - cidx (j) < nr ? false : true), \
                         true, ==, false);                              \
    }

#define SPARSE_ANY_OP(DIM) SPARSE_ANY_ALL_OP (DIM, false, false, !=, true)

#define SPARSE_SPARSE_MUL(RET_TYPE, RET_EL_TYPE, EL_TYPE)               \
  octave_idx_type nr = m.rows ();                                       \
  octave_idx_type nc = m.cols ();                                       \
                                                                        \
  octave_idx_type a_nr = a.rows ();                                     \
  octave_idx_type a_nc = a.cols ();                                     \
                                                                        \
  if (nr == 1 && nc == 1)                                               \
    {                                                                   \
      RET_EL_TYPE s = m.elem (0,0);                                     \
      octave_idx_type nz = a.nnz ();                                    \
      RET_TYPE r (a_nr, a_nc, nz);                                      \
                                                                        \
      for (octave_idx_type i = 0; i < nz; i++)                          \
        {                                                               \
          octave_quit ();                                               \
          r.data (i) = s * a.data (i);                                  \
          r.ridx (i) = a.ridx (i);                                      \
        }                                                               \
      for (octave_idx_type i = 0; i < a_nc + 1; i++)                    \
        {                                                               \
          octave_quit ();                                               \
          r.cidx (i) = a.cidx (i);                                      \
        }                                                               \
                                                                        \
      r.maybe_compress (true);                                          \
      return r;                                                         \
    }                                                                   \
  else if (a_nr == 1 && a_nc == 1)                                      \
    {                                                                   \
      RET_EL_TYPE s = a.elem (0,0);                                     \
      octave_idx_type nz = m.nnz ();                                    \
      RET_TYPE r (nr, nc, nz);                                          \
                                                                        \
      for (octave_idx_type i = 0; i < nz; i++)                          \
        {                                                               \
          octave_quit ();                                               \
          r.data (i) = m.data (i) * s;                                  \
          r.ridx (i) = m.ridx (i);                                      \
        }                                                               \
      for (octave_idx_type i = 0; i < nc + 1; i++)                      \
        {                                                               \
          octave_quit ();                                               \
          r.cidx (i) = m.cidx (i);                                      \
        }                                                               \
                                                                        \
      r.maybe_compress (true);                                          \
      return r;                                                         \
    }                                                                   \
  else if (nc != a_nr)                                                  \
    octave::err_nonconformant ("operator *", nr, nc, a_nr, a_nc);               \
  else                                                                  \
    {                                                                   \
      OCTAVE_LOCAL_BUFFER (octave_idx_type, w, nr);                     \
      RET_TYPE retval (nr, a_nc, static_cast<octave_idx_type> (0));     \
      for (octave_idx_type i = 0; i < nr; i++)                          \
        w[i] = 0;                                                       \
      retval.xcidx (0) = 0;                                             \
                                                                        \
      octave_idx_type nel = 0;                                          \
                                                                        \
      for (octave_idx_type i = 0; i < a_nc; i++)                        \
        {                                                               \
          for (octave_idx_type j = a.cidx (i); j < a.cidx (i+1); j++)   \
            {                                                           \
              octave_idx_type col = a.ridx (j);                         \
              for (octave_idx_type k = m.cidx (col) ; k < m.cidx (col+1); k++) \
                {                                                       \
                  if (w[m.ridx (k)] < i + 1)                            \
                    {                                                   \
                      w[m.ridx (k)] = i + 1;                            \
                      nel++;                                            \
                    }                                                   \
                  octave_quit ();                                       \
                }                                                       \
            }                                                           \
          retval.xcidx (i+1) = nel;                                     \
        }                                                               \
                                                                        \
      if (nel == 0)                                                     \
        return RET_TYPE (nr, a_nc);                                     \
      else                                                              \
        {                                                               \
          for (octave_idx_type i = 0; i < nr; i++)                      \
            w[i] = 0;                                                   \
                                                                        \
          OCTAVE_LOCAL_BUFFER (RET_EL_TYPE, Xcol, nr);                  \
                                                                        \
          retval.change_capacity (nel);                                 \
          /* The optimal break-point as estimated from simulations */   \
          /* Note that Mergesort is O(nz log(nz)) while searching all */ \
          /* values is O(nr), where nz here is nonzero per row of */    \
          /* length nr.  The test itself was then derived from the */   \
          /* simulation with random square matrices and the observation */ \
          /* of the number of nonzero elements in the output matrix */  \
          /* it was found that the breakpoints were */                  \
          /*   nr: 500  1000  2000  5000 10000 */                       \
          /*   nz:   6    25    97   585  2202 */                       \
          /* The below is a simplication of the 'polyfit'-ed parameters */ \
          /* to these breakpoints */                                    \
          octave_idx_type n_per_col = (a_nc > 43000 ? 43000 :           \
                                       (a_nc * a_nc) / 43000);          \
          octave_idx_type ii = 0;                                       \
          octave_idx_type *ri = retval.xridx ();                        \
          octave_sort<octave_idx_type> sort;                            \
                                                                        \
          for (octave_idx_type i = 0; i < a_nc ; i++)                   \
            {                                                           \
              if (retval.xcidx (i+1) - retval.xcidx (i) > n_per_col)    \
                {                                                       \
                  for (octave_idx_type j = a.cidx (i); j < a.cidx (i+1); j++) \
                    {                                                   \
                      octave_idx_type col = a.ridx (j);                 \
                      EL_TYPE tmpval = a.data (j);                      \
                      for (octave_idx_type k = m.cidx (col) ;           \
                           k < m.cidx (col+1); k++)                     \
                        {                                               \
                          octave_quit ();                               \
                          octave_idx_type row = m.ridx (k);             \
                          if (w[row] < i + 1)                           \
                            {                                           \
                              w[row] = i + 1;                           \
                              Xcol[row] = tmpval * m.data (k);          \
                            }                                           \
                          else                                          \
                            Xcol[row] += tmpval * m.data (k);           \
                        }                                               \
                    }                                                   \
                  for (octave_idx_type k = 0; k < nr; k++)              \
                    if (w[k] == i + 1)                                  \
                      {                                                 \
                        retval.xdata (ii) = Xcol[k];                    \
                        retval.xridx (ii++) = k;                        \
                      }                                                 \
                }                                                       \
              else                                                      \
                {                                                       \
                  for (octave_idx_type j = a.cidx (i); j < a.cidx (i+1); j++) \
                    {                                                   \
                      octave_idx_type col = a.ridx (j);                 \
                      EL_TYPE tmpval = a.data (j);                      \
                      for (octave_idx_type k = m.cidx (col) ;           \
                           k < m.cidx (col+1); k++)                     \
                        {                                               \
                          octave_quit ();                               \
                          octave_idx_type row = m.ridx (k);             \
                          if (w[row] < i + 1)                           \
                            {                                           \
                              w[row] = i + 1;                           \
                              retval.xridx (ii++) = row;                \
                              Xcol[row] = tmpval * m.data (k);          \
                            }                                           \
                          else                                          \
                            Xcol[row] += tmpval * m.data (k);           \
                        }                                               \
                    }                                                   \
                  sort.sort (ri + retval.xcidx (i), ii - retval.xcidx (i)); \
                  for (octave_idx_type k = retval.xcidx (i); k < ii; k++) \
                    retval.xdata (k) = Xcol[retval.xridx (k)];          \
                }                                                       \
            }                                                           \
          retval.maybe_compress (true);                                 \
          return retval;                                                \
        }                                                               \
    }

#define SPARSE_FULL_MUL(RET_TYPE, EL_TYPE, ZERO)                        \
  octave_idx_type nr = m.rows ();                                       \
  octave_idx_type nc = m.cols ();                                       \
                                                                        \
  octave_idx_type a_nr = a.rows ();                                     \
  octave_idx_type a_nc = a.cols ();                                     \
                                                                        \
  if (nr == 1 && nc == 1)                                               \
    {                                                                   \
      RET_TYPE retval = m.elem (0,0) * a;                               \
      return retval;                                                    \
    }                                                                   \
  else if (nc != a_nr)                                                  \
    octave::err_nonconformant ("operator *", nr, nc, a_nr, a_nc);               \
  else                                                                  \
    {                                                                   \
      RET_TYPE retval (nr, a_nc, ZERO);                                 \
                                                                        \
      for (octave_idx_type i = 0; i < a_nc ; i++)                       \
        {                                                               \
          for (octave_idx_type j = 0; j < a_nr; j++)                    \
            {                                                           \
              octave_quit ();                                           \
                                                                        \
              EL_TYPE tmpval = a.elem (j,i);                            \
              for (octave_idx_type k = m.cidx (j) ; k < m.cidx (j+1); k++) \
                retval.elem (m.ridx (k),i) += tmpval * m.data (k);      \
            }                                                           \
        }                                                               \
      return retval;                                                    \
    }

#define SPARSE_FULL_TRANS_MUL(RET_TYPE, EL_TYPE, ZERO, CONJ_OP)         \
  octave_idx_type nr = m.rows ();                                       \
  octave_idx_type nc = m.cols ();                                       \
                                                                        \
  octave_idx_type a_nr = a.rows ();                                     \
  octave_idx_type a_nc = a.cols ();                                     \
                                                                        \
  if (nr == 1 && nc == 1)                                               \
    {                                                                   \
      RET_TYPE retval = CONJ_OP (m.elem (0,0)) * a;                     \
      return retval;                                                    \
    }                                                                   \
  else if (nr != a_nr)                                                  \
    octave::err_nonconformant ("operator *", nc, nr, a_nr, a_nc);               \
  else                                                                  \
    {                                                                   \
      RET_TYPE retval (nc, a_nc);                                       \
                                                                        \
      for (octave_idx_type i = 0; i < a_nc ; i++)                       \
        {                                                               \
          for (octave_idx_type j = 0; j < nc; j++)                      \
            {                                                           \
              octave_quit ();                                           \
                                                                        \
              EL_TYPE acc = ZERO;                                       \
              for (octave_idx_type k = m.cidx (j) ; k < m.cidx (j+1); k++) \
                acc += a.elem (m.ridx (k),i) * CONJ_OP (m.data (k));    \
              retval.xelem (j,i) = acc;                                 \
            }                                                           \
        }                                                               \
      return retval;                                                    \
    }

#define FULL_SPARSE_MUL(RET_TYPE, EL_TYPE, ZERO)                        \
  octave_idx_type nr = m.rows ();                                       \
  octave_idx_type nc = m.cols ();                                       \
                                                                        \
  octave_idx_type a_nr = a.rows ();                                     \
  octave_idx_type a_nc = a.cols ();                                     \
                                                                        \
  if (a_nr == 1 && a_nc == 1)                                           \
    {                                                                   \
      RET_TYPE retval = m * a.elem (0,0);                               \
      return retval;                                                    \
    }                                                                   \
  else if (nc != a_nr)                                                  \
    octave::err_nonconformant ("operator *", nr, nc, a_nr, a_nc);               \
  else                                                                  \
    {                                                                   \
      RET_TYPE retval (nr, a_nc, ZERO);                                 \
                                                                        \
      for (octave_idx_type i = 0; i < a_nc ; i++)                       \
        {                                                               \
          octave_quit ();                                               \
          for (octave_idx_type j = a.cidx (i); j < a.cidx (i+1); j++)   \
            {                                                           \
              octave_idx_type col = a.ridx (j);                         \
              EL_TYPE tmpval = a.data (j);                              \
                                                                        \
              for (octave_idx_type k = 0 ; k < nr; k++)                 \
                retval.xelem (k,i) += tmpval * m.elem (k,col);          \
            }                                                           \
        }                                                               \
      return retval;                                                    \
    }

#define FULL_SPARSE_MUL_TRANS(RET_TYPE, EL_TYPE, ZERO, CONJ_OP)         \
  octave_idx_type nr = m.rows ();                                       \
  octave_idx_type nc = m.cols ();                                       \
                                                                        \
  octave_idx_type a_nr = a.rows ();                                     \
  octave_idx_type a_nc = a.cols ();                                     \
                                                                        \
  if (a_nr == 1 && a_nc == 1)                                           \
    {                                                                   \
      RET_TYPE retval = m * CONJ_OP (a.elem (0,0));                     \
      return retval;                                                    \
    }                                                                   \
  else if (nc != a_nc)                                                  \
    octave::err_nonconformant ("operator *", nr, nc, a_nc, a_nr);               \
  else                                                                  \
    {                                                                   \
      RET_TYPE retval (nr, a_nr, ZERO);                                 \
                                                                        \
      for (octave_idx_type i = 0; i < a_nc ; i++)                       \
        {                                                               \
          octave_quit ();                                               \
          for (octave_idx_type j = a.cidx (i); j < a.cidx (i+1); j++)   \
            {                                                           \
              octave_idx_type col = a.ridx (j);                         \
              EL_TYPE tmpval = CONJ_OP (a.data (j));                    \
              for (octave_idx_type k = 0 ; k < nr; k++)                 \
                retval.xelem (k,col) += tmpval * m.elem (k,i);          \
            }                                                           \
        }                                                               \
      return retval;                                                    \
    }

#endif
