---
name: "gpiv_sstrain"
section: "1"
platform: "linux"
package: "gpivtools"
version: "0.6.0-3.1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/gpiv_sstrain"
---

# gpiv\_sstrain(1)

Calculates the shear strain from PIV data.

## NAME

gpiv\_sstrain - Calculates the shear strain from PIV data.

## SYNOPSIS

**gpiv\_sstrain** \[**-d** *N*\]  \[**-h** \| **--help**\]  \[**--no\_g** \] \[**-p** \| **--print**\]  \[**-g** \| **--g**\]  \[**-v** \| **--version**\]  \[*filename*\]  \< *stdin* \> *stdout*

## DESCRIPTION

**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 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***.sstr**.  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