NAME

       gpiv_nstrain - Calculates normal strain from PIV data.

SYNOPSIS

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

DESCRIPTION

       gpiv_nstrain calculates the normal 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 one 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

       -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 successfully.

       filename
              Input  PIV  data  file.  Overrides  stdin and stdout. The output will be written to
              filename.nstr.  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                          GPIV_NSTRAIN(1)