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general-purpose nonlinear curve fitting and data analysis

Fityk is a flexible and portable program for nonlinear fitting of analytical functions (especially peak-shaped) to data (usually experimental data). In other words, for nonlinear peak separation and analysis.

It was developed for analyzing diffraction patterns, but can be also used in other fields, since concepts and operations specific for crystallography are separated from the rest of the program.

Fityk offers various nonlinear fitting methods, subtracting background, calibrating data, easy placement of peaks and changing peak parameters, automation of common tasks with scripts, and much more. The main advantage of the program is flexibility - parameters of peaks can be arbitrarily bound to each other, eg. the width of a peak can be an independent variable, can be the same as the width of another peak or can be given by a complicated - common to all peaks - formula.

Package version:0.8.6-2


For compilation instructions and portability issues read file INSTALL. 

If anything doesn't work as expected, contact fityk-users mailing list
or Marcin Wojdyr ( See for details.


This directory contains small samples of data 
and scripts that are used to test the program.
Paths to data in scripts are relative, so you can either run script
from this directory or change the paths.

nacl01 - 'Hello world' sample
SiC_Zn - Powder pattern sample 
test_syntax - testing the command parser, just a set of random commands - testing the fityk library - testing


FITYK(1)                                                    FITYK(1)

       fityk - non-linear curve fitting and data analysis

       fityk [OPTION]... [FILE]...
       cfityk [OPTION]... [FILE]...

       This  manpage documents briefly the fityk and cfityk programs
       for nonlinear fitting  of  analytical  functions  (especially
       peak-shaped)  to  data  (u


fityk (0.8.6-2) unstable; urgency=high

  * Compile against libwxgtk2.8-dev so Help/Manual works (Cl


$Id: NEWS 424 2008-04-15 11:08:42Z wojdyr $

User-visible changes in version 0.8.6  (2008-04-15):


$Id: TODO 424 2008-04-15 11:08:42Z wojdyr $

Help is needed:

- C++ coding: see the list of ideas at


This package was debianized by Carlo Segre <> on
Wed, 23 Jul 2003 23:32:33 -0500.


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