General

LS-OPT provides a user-defined interface to extract response and history results, respectively. Any user-defined program, e.g. C, Fortran or Perl programs, or any post-processor, e.g. LS-PREPOST may be used to extract results.

User-defined Responses

The user-defined program has to output a single floating-point number to standard output.

Example

In this example, a Perl program is used to extract a response.

response 'Response' 1 0 "../../extract_response.pl"

An example for a Perl program extracting a response result is given below.

#!/usr/bin/perl

# open file
open(IN,"results.txt");

$i = 0; # variable to count line number

# read file
while(<IN>){
  
  # first value in 10th line is response value
  if ($i == 10){
    @output = split;
    last;
  }

  $i++;

}

# print value to standard output
print ("$output[0]\n");

# close file
close(IN);

User-defined Histories

The user-defined program is used to produce a file named LsoptHistory containing xy data.

Example

 In this example, the post-processor LS-PREPOST is used to extract a history result.

history 'Force' "lspp c=../../get_force -nographics"

The LS-PREPOST command file get_force is given below.

open d3plot d3plot
ascii rcforc open rcforc 0
ascii rcforc plot 4 Ma-1
xyplot 1 savefile xypair LsoptHistory 1
deletewin 1
quit

To create the LS-PREPOST command file, execute the appropriate commands in LS-PREPOST. LS-PREPOST saves the executed steps in the command file lspost.cfile.