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Fityk is nonlinear curve-fitting and data analysis software. It allows data visualization, separation of overlapping peaks, and least squares fitting using standard Levenberg-Marquardt algorithm, a genetic algorithm, or Nelder-Mead simplex method. It knows about many functions (mostly bell-shaped, like Gaussian, Loretzian, Pearson 7, Voigt, Pseudo-Voigt, and Doniach-Sunjic) and user-defined functions can be easily added. It also enables background subtracting, data calibration, and task automation with a simple script language. It is mainly used to analyze powder diffraction patterns, chromatography, photoluminescence, infrared, and Raman spectroscopy, but it can be used to fit analytical functions to any kind of data.

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2011-10-01 01:48

A few minor bugs have been fixed. One new dialog (Model-Export Formula) has been added to the GUI.

2011-07-19 23:50

A Lua interpreter has been embedded in the program. It is possible to subtract a background stored in another file now. Support for mouse wheel and extra buttons has been added. All reported bugs have been fixed.

2011-06-10 14:05

A few minor bugs have been fixed.

2011-04-01 01:03

New features include anti-aliasing, calculation of confidence intervals, and a better automatic placement of peaks. Also, a few bugs have been fixed and calculation of the exponentially modified Gaussian (EMG) function has been improved.

2011-03-23 15:25

The program has been ported to Mac OS X (10.4 or later). Several dialog windows have been redesigned. All reported bugs have been fixed.

Project Resources