© Sébastien Merkel, Université Lille 1, France
Since June 2011, polydefix is open source software, licensed under the GPL Version 2.
Multifit/Polydefix homepage is at http://merkel.zoneo.net/Multifit-Polydefix/
Multifit/Polydefix is an open-source IDL software package for an efficient processing of diffraction data obtained in deformation apparatuses at synchrotron beamlines. Multifit allows users to decompose two-dimensional diffraction images into azimuthal slices, fit peak positions, half-widths, and intensities, and propagate the results to other azimuth and images. Polydefix is for analyzes of deformation experiments. Starting from output files created in Multifit or other packages, it will extract elastic lattice strains, evaluate sample pressure and differential stress, and prepare input files for further texture analysis.
Multifit/Polydefix homepage is at http://merkel.zoneo.net/Multifit-Polydefix/
Polydefix is for lattice strains, pressure, stress, and texture analysis (see below). It will start from the output iles created in Multifit and extract the information required for establishing the rheological behavior of the sample.
Multifit/Polydefix is written in the Interactive Data Language (IDL) provided by Exelis Visual Information Solutions (Boulder, Colorado). It is an open-source software package, licensed under GNU General Public License that runs within the IDL Virtual Machine, as provided at no-cost by Exelis Visual Information. It will run on any platform with an IDL Virtual Machine, Windows, OS X, Linux, and Solaris. The IDL Virtual Machine does not require a license to run. An IDL license is required, however, for developing, compiling, and adding new features.
IDL comes with a complex eclipse-based development environment in a graphical user interface (gui) for editing projects. Over the years the gui became more and more complex. It is a complete overkill for what we are doing here. Moreover, each upgrade of IDL comes with technical issues and, recently, it simply stopped working on my computers. Therefore, I decided to completely quit using the IDL gui for developing applications and develop multifit/polydefix in text mode only. You are welcome to try using the gui if you want, but I will not help you with it.
Once you downloaded the latest version of the code, you can simply open the files in your favorite text editor. I use kate, one of the KDE text editor. It does have a specific mode for coloring IDL codes (select Tools -> Highlighting -> Sources -> RSI IDL).
To compile and run the code, you should move into the folder with your source,
start IDL in the command line, and type @build:
cd ~/IDL/Polydefix
idl
@build
You can then test your changes by typing
polydefix
in the command line. It will start the latest version you compiled.
Once you're done, if you want to quit IDL, simply type exit in the IDL command line.
I do not recommend the IDL development environment. On the other hand, the online help is extremely helpful. To start the help from the command line, simply type idlhelp.
Build
Build instructions are in file "build" To build, type @build in IDL command prompt.
UI Components
- main.pro program start, calls experimentWindow.pro
- experimentWindow.pro main UI functions to set the wavelength, fit files, set HKL planes, show about...
- fitLatticeStrainsWindow.pro UI and functions to test lattice strains fits
- fitPressureWindow.pro UI and functions to test pressure fits
- fitUnitCellWindow.pro UI and functions to test cell parameters fits
- materialWindow.pro UI and function to set material properties (name, symmetry, EOS, elasticity)
- plotinteractive1D.pro UI to have a plot
- plotTestLatticeStrains.pro UI that with the lattice strain tests
- showprogress.pro UI for a progress bar
- diffIntensityWindow.pro UI for intensity vs. orientation for diffent images
- diffIntensityWindow2.pro UI for intensity vs. image for diffent orientations
Data classes
- experimentObject.pro Main experiment data: where is it stored, wavelength, material, and all functions to work on it
- materialObject.pro Material data + functions on EOS and elasticity
- unitCellObject.pro unit cell function, get dhkl or volumes from unit cell parameters
- fitPatternObject.pro holds all fitSubPatternObject objects, knows how to fit lattice strains equations
- fitSubPatternObject.pro holds data for one subpattern (2theta, intensity vs azimuth and such)
- latticestrainObject.pro holds a lattice strain fit
Utils
- fdecomp.pro
- func.gui.pro
- func.pro
- latticeStrainMultiplePeaksCenter.pro equations for lattice strain fits with center correction, called from a fitPatternObject
- latticestrain.pro equations for for lattice strain fits with NO center correction, called from a fitSubPatternObject
- line.pro other type of lattice strain fits, not called
- mpfitfun.pro non linear fitting
- mpfit.pro non linear fitting