Fityk

Fityk

Fityk 1.0.1 under Windows
Developer(s)	Marcin Wojdyr
Initial release	2004
Stable release	1.2.9 / April 13, 2014
Written in	C++
Operating system	Cross-platform
Type	Curve fitting
License	GNU GPLv2+
Website	fityk.nieto.pl

Fityk is a 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.

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.

Fityk is distributed under the terms of GNU General Public License, but since version 1.0.0, subscription is required for downloading binaries. It runs on GNU/Linux, Mac OS X, 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.

Features

• three weighted least squares methods:
  • Levenberg-Marquardt algorithm,
  • Nelder-Mead method
  • Genetic algorithm
• 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.

Alternatives

The programs peak-o-mat and MagicPlot have similar scope.

More generic data analysis programs with spread-sheet capabilities include the proprietary Origin and its free clones QtiPlot and SciDAVis.

External links

• Official homepage
• Marcin Wojdyr, Fityk: a general-purpose peak fitting program, Journal of Applied Crystallography, 2010, Volume 43, pages 1126-1128