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NAME

       gpiv_vorstra  - Calculates the differential quantities vorticity, shear
       strain and normal strain from PIV data.

SYNOPSIS

       gpiv_vorstra [-d N] [-h | --help] [-n |  -o  |  -s]  [--no_g  ]  [-p  |
       --print] [-g | --g] [-v | --version] [filename] < stdin > stdout

DESCRIPTION

       gpiv_vorstra  calculates  the  differential  quantities like vorticity,
       shear strain and normal strain from  PIV  data.  You  can  choose  from
       several  differential  schemes: central differentiation, least squares,
       Richardson extrapolation and  circulation  method.  Circulation  method
       only  allows  to  calculate vorticity, but no strain. 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.

Options

       -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

       -n     Calculate normal strain of the PIV data. As an  alternative  the
              program   may   be  called  by  its  nickname  gpiv_nstrain.  In
              combination  with  filename  the  output  will  be  written   to
              filename.nstr.

       -o     Calculate  vorticity  of  the  PIV  data.  As an alternative the
              program may be called by its nickname gpiv_vorty. In combination
              with filename the output will be written to filename.vor.

       -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.

       -s     Calculate  shear  strain  of the PIV data. As an alternative the
              program may be called by its nickname  sstrain.  In  combination
              with filename the output will be written to filename.sstr.

       -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
              successfully.

       filename
              Input PIV data file. Overrides stdin and stdout. The output will
              be  written  to  filename.vor  with -o, filename.nstr with -n or
              filename.sstr with -s.  Parameters are  stored  in  filename.par
              and may be used for future use by including them in ./gpivrc.

SEE ALSO

       gpivtools

AUTHOR

       Gerber Van der Graaf

                                8 November 2006