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       gpiv_sstrain - Calculates the shear strain from PIV data.


       gpiv_sstrain  [-d  N] [-h | --help] [--no_g ] [-p | --print] [-g | --g]
       [-v | --version] [filename] < stdin > stdout


       gpiv_sstrain calculates the shear strain from PIV data. You can  choose
       from  several  differential  schemes:  central  differentiation,  least
       squares and Richardson extrapolation. The output can  be  generated  as
       ASCII  data  containing  four  columns  or  as GNUPlot Data format that
       allows to view/print the data as contour plots.

       The configuration parameters (containing the POST key) may be overruled
       by the command line options, as explained below.


       -d N   Differential  type  to  be used: central difference (N=0), least
              squares  (N=1),  Richardson  interpolation  (N=2),   circulation
              method (N=3)

       -h | --help
              On-line help

       -p | --print
              Print parameters, command line options and eventually used input
              and output  filenames  to  stdout.  The  output  is  identic  of
              filename.par, in case filename is used.

       -g     Show contour plot of the output with gnuplot.

       --no_g Suppresses to show contour plot of the output with gnuplot.

       -v | --version
              Print   version   information  on  standard  output,  then  exit

       filename Input PIV data file. Overrides stdin and stdout. The
              output will be written to filename.sstr.  Parameters are  stored
              in filename.par and may be used for future use by including them
              in ./gpivrc.




       Gerber Van der Graaf

                                8 November 2006