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The helper plot is also handy for zooming with left and middle mouse buttons. It can also show weighted or cumulative 3ħ difference, and a couple of other things. By default, the plot shows the difference between the data and the model. You may have one, two or no helper plots (GUI Show). The helper plot shows how well the model fits the data. Use can configure what is displayed and how (through GUI Configure or context menu).
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The following people have contributed to this manual (in chronological order): Marcin Wojdyr (maintainer), Stan Gierlotka, Jaap Folmer, Michael Richardson Open Source 2Ħ CHAPTER 2 Getting Started Graphical Interface That s how the GUI (Graphical User Interface) looks like: The main plot can display data points, model that is to be fitted to the data and individual functions in the model. Alternatively, go to GitHub 12, open corresponding rst file, press Fork and edit this file button, do edits in your web browser and click Propose file change. Use the Show Source link to get the source of the page, edit it and send me either the modified version or a patch. All corrections and improvements are welcome. About this manual This manual is written in ReStructuredText. xylib 10 library handles reading data files Lua 11 interpreter is embedded for scripting and a few popular libraries and tools that make programming much easier: wxwidgets (GUI), Boost (misc), zlib (compression), readline (CLI), SWIG (bindings), Catch (testing).
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It uses a few open source projects: NLopt 8 for several optional fitting methods one of the fitting methods uses MPFIT 9 library (MINPACK-1 Least Squares Fitting Library in C), which includes software developed by the University of Chicago, as Operator of Argonne National Laboratory.
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If you are interested, please find the source code at GitHub 7. 43, (2010) ĥ Open Source Fityk is open-source (GPL2+ 6 ). To download the latest version of the program or to contact the author visit 3.
#Fityk free download windows how to#
If you don t know how to handle your case, do not hesistate to ask on the users group 2 or contact the author. You can model zero-shift in your instrument or do more complicated refinement of the X scale. You can fit multiple datasets together using common set of parameters. You can specify sophisticated dependencies between parameters of the functions (say, peak widths given as a function of peak positions).
But the program can also handle quite complex scenarios.
You select a built-in function type (such as Gaussian, Voigt, sigmoid, polynomial and dozens of others) place it with the mouse, place other functions and click a button to fit it.
Let say that you want to model the data with multiple peaks or other function shapes. In simple cases, the program can be operated with mouse only.
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Fityk offers various nonlinear fitting methods, simple background subtraction and other manipulations to the dataset, easy placement of peaks and changing of peak parameters, support for analysis of series of datasets, automation of common tasks with scripts, and much more. It is reportedly 1 used in crystallography, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, to name but a few. Apart from the actual fitting, the program helps with data processing and provides ergonomic graphical interface (and also command line interface and scripting API but if the program is popular in some fields, it s thanks to its graphical interface). To put it differently, it is primarily peak fitting software, but can handle other types of functions as well. 2 Contents 1 Introduction Open Source About this manual Getting Started Graphical Interface Minimal Example Command Line Data Loading Data Supported Filetypes Reading Text Files Active and Inactive Points Standard Deviation (or Weight) Data Point Transformations Aggregate Functions Functions and Variables in Data Transformation Working with Multiple Datasets Dataset Transformations Exporting Data Models Variables Domains Function Types and Functions Built-In Functions Variadic Functions User-Defined Functions (UDF) Cutoff Model, F and Z Guessing Initial Parameters Displaying Information Curve Fitting Nonlinear Optimization Uncertainty of Parameters Bound Constraints Fitting Related Commands Levenberg-Marquardt Nelder-Mead Downhill Simplex iģ 5.7 NLopt Scripts Working with Scripts Fityk DSL Grammar Fityk library API Input / output Settings Data General Info Model info Fit statistics Examples in Lua All the Rest Settings Data View Information Display info print debug Other Commands Starting fityk and cfityk iiĤ CHAPTER 1 Introduction Fityk is a program for nonlinear fitting of analytical functions (especially peak-shaped) to data (usually experimental data).
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