23 lines
1.1 KiB
Plaintext
23 lines
1.1 KiB
Plaintext
Fityk is a general-purpose nonlinear curve fitting and data analysis software.
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Although it is being developed to analyze powder diffraction patterns, it can
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be used to fit analytical functions to any kind of data: crystallographic
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module is an independent part of the program. Apart from crystallography fityk
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is reported to be used also in chromatography, photoluminescence, infrared and
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Raman spectroscopy, and in other fields.
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At present fityk knows only about common peak-shaped functions (Gaussian,
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Lorentzian, Voigt, Pearson VII etc.) and polynomial. User-defined functions
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will be implemented in 2005.
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In terms of powder diffraction fityk will fit the data with a set of position-
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correlated peaks to give the refined lattice parameters, zero-shift, sample
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displacement and wavelength.
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Fityk offers everything a decent refinement program should offer but first of
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all intuitive graphical interface. Apart from the standard Marquardt least-
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square algorithm one may choose a genetic algorithm or Nelder-Mead simplex
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method for complex or unstable cases.
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WWW: http://fityk.sourceforge.net/
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