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Fityk is curve fitting and data analysis application, predominantly used to fit analytical, bell-shaped functions to experimental data. It is positioned to fill the gap between general plotting software and programs specific for one field, e.g. crystallography or XPS.[1]
 | |
 Fityk 1.0.1 under Windows | |
| Developer(s) | Marcin Wojdyr |
|---|---|
| Initial release | 2004 |
| Stable release | 1.3.1
/ 19 December 2016 |
| Repository | |
| Written in | C++ |
| Operating system | Cross-platform |
| Type | Curve fitting |
| License | GNU GPL |
| Website | fityk |
Originally, Fityk was developed to analyse powder diffraction data. It is also used in other fields that require peak analysis and peak-fitting, like chromatography or various kinds of spectroscopy.[2]
Fityk is free and open source, distributed under the terms of GNU General Public License, with binaries/installers available free of charge on the project's website. It runs on Linux, macOS, Microsoft Windows, FreeBSD and other platforms. It operates either as a command line program or with a graphical user interface.
It is written in C++, using wxWidgets, and providing bindings for Python and other scripting languages.
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- three weighted least squares methods:
- about 20 built-in functions and support for user-defined functions
- equality constraints
- data manipulations,
- handling series of datasets,
- automation of common tasks with scripts.
The programs LabPlot, MagicPlot and peak-o-mat have similar scope.
More generic data analysis programs with spread-sheet capabilities include the proprietary Origin and its clones QtiPlot (paid, closed source) and SciDAVis (non-paid, open source).
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