## SYNOPSIS

PERL PROGRAM NAME: 

AUTHOR:  

DATE:

DESCRIPTION:

Version:

## USE

### NOTES

#### Examples

## SYNOPSIS

### SEISMIC UNIX NOTES
 SUOP - do unary arithmetic operation on segys 		

    suop <stdin >stdout op=abs                                     



    Required parameters:                                           

           none                                                    



    Optional parameter:                                            

           op=abs          operation flag                          

                           abs   : absolute value                  

                           avg   : remove average value            

                           ssqrt : signed square root              

                           sqr   : square                          

                           ssqr  : signed square                   

                           sgn   : signum function                 

                           exp   : exponentiate                    

                           sexp  : signed exponentiate             

                           slog  : signed natural log              

                           slog2 : signed log base 2               

                           slog10: signed common log               

                           cos   : cosine                          

                           sin   : sine                            

                           tan   : tangent                         

                           cosh  : hyperbolic cosine               

                           sinh  : hyperbolic sine                 

                           tanh  : hyperbolic tangent              

                           cnorm : norm complex samples by modulus ", 

                           norm  : divide trace by Max. Value      

                           db    : 20 * slog10 (data)              

                           neg   : negate value                    

                           posonly : pass only positive values     

                           negonly : pass only negative values     

                          sum   : running sum trace integration   

                          diff  : running diff trace differentiation

                          refl  : (v[i+1] - v[i])/(v[i+1] + v[i]) 

                           mod2pi : modulo 2 pi                    

                           inv   : inverse                         

                           rmsamp : rms amplitude                  

                          s2v   : sonic to velocity (ft/s) conversion     

                          s2vm  : sonic to velocity (m/s) conversion     

                          d2m   : density (g/cc) to metric (kg/m^3) conversion 

                          drv2  : 2nd order vertical derivative 

                          drv4  : 4th order vertical derivative 

                          integ : top-down integration            

                          spike : local extrema to spikes         

                          saf   : spike and fill to next spike    

                          freq  : local dominant freqeuncy        

                          lnza  : preserve least non-zero amps    

                          --------- window operations ----------- 

                          mean  : arithmetic mean                 

                          despike  : despiking based on median filter

                          std   : standard deviation              

                          var   : variance                        

          nw=21           number of time samples in window        

                          --------------------------------------- 

                           nop   : no operation                    



    Note:  Binary ops are provided by suop2.                       

    Operations inv, slog, slog2, and slog10 are "punctuated",      ", 

    meaning that if, the input contains 0 values,                  

    0 values are returned.                                 ",      



    For file operations on non-SU format binary files use:  farith



    Credits:



    CWP: Shuki Ronen, Jack K Cohen (c. 1987)

     Toralf Foerster: norm and db operations, 10/95.

     Additions by Reg Beardsley, Chris Liner, and others.



    Notes:

           If efficiency becomes important consider inverting main loop

         and repeating operation code within the branches of the switch.



           Note on db option.  The following are equivalent:

           ... | sufft | suamp | suop op=norm | suop op=slog10 |\

                   sugain scale equals 20| suxgraph style=normal



           ... | sufft | suamp | suop op=db | suxgraph style=normal

## User's notes (Juan Lorenzo)

    An additional parameter called "list"  allows the operation
    to be repeated among multiple files.

    The names of the su files are in the list.

    The list is found in $DATA_SEISMIC_TXT.
    Output file names carry a suffix equal to the operation
    variable. For example,

       file1_neg.su

## CHANGES and their DATES

## Import packages

## instantiation of packages

## Encapsulated
hash of private variables

## sub Step

collects switches and assembles bash instructions
by adding the program name

## sub note

collects switches and assembles bash instructions
by adding the program name

## sub clear

## sub \_get\_inbound

## sub \_set\_inbound\_list

## sub \_get\_file\_names

## sub list

    list array

## sub nw 

## sub op 

## sub get\_max\_index

max index = number of input variables -1
