GPIV_VORTY(1)						      General Commands Manual						     GPIV_VORTY(1)

NAME

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

SYNOPSIS

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

DESCRIPTION

       gpiv_vorty 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 one to calculate vorticity, but no strain. The output can be generated as ASCII data containing four columns or as GNUPlot Data for-
       mat 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 file-
	      name.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.vor. 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_VORTY(1)