Nonlinear curve-fitting and data analysis application
Fityk is specialized in fitting peaks (bell-shaped functions like Gaussian, Loretzian, Pearson 7, Voigt) to experimental data. There are also people using it to remove the baseline from data, or to display data only.
Fityk is reportedly used in crystallography, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, to name but a few.
Fityk knows about common peak-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.) and polynomials. It also supports user-defined functions.
Fityk offers intuitive graphical interface (and also command line interface), various optimization methods (standard Marquardt least-square algorithm, Genetic Algorithms, Nelder-Mead simplex), equality constraints, modelling error of x coordinate of points (eg. zero-shift of instrument), handling series of datasets, automation of common tasks with scripts, and more.
Fityk is free and works under Mac OS X, Linux, FreeBSD, and MS Windows.
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What's New in This Release:
- a few optimization methods from the NLopt library have been added
- MPFIT and NLopt methods support box constraints
- simplifications that made using external libraries easier: