This package contain GenX 3.2 a program to refine x-ray and neutron reflectivity as well as surface x-ray diffraction using differential evolution. It can also serve as a general fitting program.

Support
=======
Tutorials can be found at: http://genx.sourceforge.net/doc/
Examples can be found in the Menu Help->Examples.
If you need more support send an e-mail to artur.glavic@psi.ch.

References
==========
If you use the program please give reference to the following publication:
M. Bjorck and G. Andersson J. Appl. Cryst. 40, 1174 (2007).

Changes 3.3.0
=============
 * Updated the documentation website to include the SimpleReflectivity interface
 * Reimplementation of the off-specular and x-ray surface diffraction models (sxrd, sxrd2, interdiff)
 * In Reflectometry plugin, automatically update the GUI when the script is changed manually
 * Add an alpha version of ORSO text format data reader
 * Make auto data loader the default, this includes the following loaders:
   (default, resolution, sns_mr, amor, d17_cosmos, orso)
   Please send me your instrument data files as examples if you want your own data loader that can include meta data, too.
 * Fix crashes in Linux systems when changing parameters in the grid (especially when automatic update is active)
 * Fix incompatibility with h5py version 3 when loading models
 * Fix the d17_cosmos data loader and add d17_legacy for old style files
 * Fix issues in windows binary that prohibited opening of Help dialogs
 * New type os user parameter intended for systematic errors that influence all datapoints. It has
   a sigma parameter and biases the FOM with (x0-x)²/sigma² to take the systematic error uncertainty
   into account.
 * The column calculation now supports a rms(sigma1, sigma2, ...) function to combine different error contributions
 * Example columns showing how to include systematic errors from motor position and/or beam distribution uncertainty
 * Remove unnecessary sleep per iteration when fitting in single thread mode. Please report if you notice issues like
   crashes
 * Some additional improvements for simulation performance

Changes 3.2.3
=============
 * Fix a bug in footprint correction introduced in 3.2.0
 * Improve parameter grid interface with parameter relative value indicator and slider controls
 * Allow copy & paste in parameter grid
 * Can now use space to start edit on selected parameter and to accept parameter changes
 * Fix a DPI display bug for toolbar icons aside grid
 * Can not toggle negative value with "-" at any edit location in the value editor
 * Don't automatically open context menu on single click of first column, allows to select and edit manually easier

Changes 3.2.2
=============
 * Update windows build to python 3.9 and wxPython 4.1.1 to better support High DPI displays
 * Improve value entry in parameter grid (ENTER/TAB key, mouse scrolling)
 * Prevent parameter grid entry resizing to prevent non-intentional layout issues
 * Automatize PyPI releases

Changes 3.2.1
=============
 * Fix error in new Numba functions that calculate the resolution vector (ORSO validation failed)

Changes 3.2.0
=============
 * Add simple API for use in python scripts and Jupyter notebooks. Can read, write, modify and fit models
 * Add some examples of Jupyter notebooks to show usage of API
 * Integration of GenX models into bumps library (see https://bumps.readthedocs.io/en/latest/index.html )
 * Dialog for statistical error analysis with bumps MCMC to evaluate cross-correlations of parameters
 * New export function (alpha) for ORSO text format with detailed header containing analysis information
 * Improvements to script editor behavior concerning indentation
 * Reflectivity plugin now re-analyses a manually changed script after it has been run once
 * SimpleReflectivity now shows an error summary dialog when errorbars are calculated
 * New 'auto' data loader that chooses the method by file type, supports AMOR, SNS MR, default and resolution loaders
 * Improvements in reflectivity model performance, possibility to use CUDA with multiprocessing
 * Improvements in plot performance for data and SLD graphs
 * Some refactoring of code started
 * Fix SimpleLayer plugin to allow multiple materials with same chemical formula
 * Fix some bugs where plot updates could crash the GUI or freeze the SLD graph

Changes 3.1.4
=============
 * Fix bug in mag_ref (issue #178)
 * Update GenX documentation website

Changes 3.1.3
=============
 * Fix some GUI crashes on wxPython >=4.1
 * Fix GUI issue/crash when auto update SLD is active (issue #177)
 * Fix about dialog
 * Use new DPI scaling function for better cross-platfrom high DPI handling, if available (wxPython >=4.1)

Changes 3.1.2
=============
 * Small fix of build system and contact email.

Changes 3.1.1
=============
 * Update build system to be compatible with PyPI, thanks to Leon Lohse
 * Include vtk module in windows distribution for SXRD plugin

Changes 3.1.0
=============
 * Implement numba JIT compiler for significant x-ray and neutron reflectivity calculation performance gain
 * Implement GPU accelerated version with CUDA (NVidia graphics cards, menu option to activate)
 * SpinAsymmetry plugin to plot the SA for data and model
 * Exporter plugin for reflectivity models, up to now supports BornAgain python scripts
 * Several bug fixes in various modules

Changes 3.0.8
=============
 * Fix some issues with newer wxPython versions (4.1.1)
 * Fix an error in the unit for neutron SLD display (10^-6 AA^-1)
 * Automatic build process on github

Changes 3.0.7
=============
 * Fix bug in spec_nx when trying to use spin-flip model
 * Fix bug #160 in spin-flip that would not recognize a changed model correctly
 * Add button to SimpleReflectivity for switching to Reflecivity plugin for more complex models

Changes 3.0.6
=============
 * Fix GUI bugs reported in tickets #172 and #173

Changes 3.0.5
=============
 * Fix some handling of fomulas and material in SimpleLayer and SimpleReflectivity plugin

Changes 3.0.4
=============
 * Fix bugs #171 and #169

Changes 3.0.3
=============
 * Fix bug in spin-flip model that failed simulation with an error
 * Try to make SXRD work again

Changes 3.0.2
=============
 * Fix plotting error when loading new dataset with different shape
 * Fix sample parameter dialog not evaluating input type correctly in spec_adaptive model (#167)

Changes 3.0.1
=============
 * Fix issue with model table when creating new model in SimpleReflectivity
 * Fix unicode error in sns_mr data loader
 * Handle footpring and tth offset parameter correctly when ToF neutron is selected
 * Update windows installer to run with user privileges
 * Fix evaluation of extra data columns like "res"

Changes 3.0.0
=============
 * Convert to python 3
 * Convert to wxPython 4 (Phoenix)
 * Add new SimpleReflectivity plugin for simple structures and beginner users
 * Updated icons with dpi awareness
 * New optional wide screen optimized GUI that allows to see Data and SLD side-by-side
 * Improved SimpleLayer materials database with query to Materials Project and Open Crystallography databases
 * Fix windows binary to work with Windows 10 without compatibility mode
 * Improved plot layout that uses full space, provides correct axes labes and can be copied with white background


Changes 2.4.9
=============
 * Fixed bug in SimpleLayer plugin - could not load cif files under OSX.

Changes 2.4.8
=============
 * Fixed bug that delete and backspace did not work in the parameter grid under Windows.
 * Fixed so that data can be loaded with the resolution data loader.
 * Fixed bug in the SimpleLayer plugin.
 * Small bug fixes in parameter and data model classes

Changes 2.4.7
=============
 * Fixed bug, parallel fitting with mag_refl stopped in "going into optimisation".
 * Fixed bug with adding data sets into a new reflectivity plugin model.
 * Fixed wrong spin state calculations in soft_nx

Changes 2.4.6
=============
 * Fixed bug that the SLD for neutrons were scaled with wl**2/2/pi.

Changes in 2.4.5
================
 * Fixed bug that the SLD for neutrons were scaled with wl**2/2/pi.
 * Problem with the precision in some neutron calculations solved.
 * Numbers in the grid can be given in scientific/exponential notation, for example 1e5.
 * Problems with fractional numbers using "." on systems with defualt deciaml seprator as "," solved.
 * Scan FOM not always functioning with blank rows in the grid solved.

Changes in 2.4.2
================
 * Minor bug fixes in the gui
 * Fixed that the models ignored negative b's (spec_nx and mag_refl)

Changes 2.4.0
=============
 * Added sliders and spin controls to change the parameter values, updated dynamically.
 * A new reflectivity aimed to soft matter called soft_nx.
 * Added the possibility to have a logarithmic x scale.
 * Data points causing nan and inf in the FOM can be ignored (see the Options dialog).
 * A resolution type for constant dq/q have been added to spec_nx and soft_nx.
 * Simulation data sets can be created through a wizard.
 * Added data loader for SNS BL4A (programmer: Artur Glavic)
 * Added plugin to more easily define layers (programmer: Artur Glavic)
 * Various bug fixes.

Changes 2.3.6
=============
 * Fixed bug regarding the definition of instruments (not working) in the Reflectivity plugin.
 * Fixed bug that caused an error when trying to fit the number of repetitions.
 * Fixed bug regardgin q=0 simualtions - the models now throws an error for q = 0.
 * Fixed bug in the buffering of spin flip calculations (caused an error when trying to simulate data sets with differing number of x-values).
 * Fixed not working choice boxes in the Calculation dialog.
 * Added an data loader for four column data which also includes the resolution.
 * Included so that 'du' works in spec_nx for calculating spin flip and the same thing in mag_refl.


Changes 2.3.5
=============
 * Fixed bug that GenX does not start after installation on Windows machine.
 * Fixed bug so that command line execution works better on frozen versions.
 * Fixed bugs regarding the c extensions in the frozen version.

Changes 2.3.0
=============
 * Changed the x-ray scattering length data tables to use the ffast nist, which
   is more accurate at low energies, database:
   http://www.nist.gov/pml/data/ffast/index.cfm
 * Refurbished the table of fitting parameters with new functionality and a new toolbar.
 * The reflectivity plugin has been improved:
   - Which parameter to fit can be set in the sample definition dialogs.
   - The Sample tab shows the current value of the fitted parameters and also indicates which are fitted.
 * Command line fitting has been added. Possible to run fit without the GUI.
 * A new file format based on hdf5 has been implemented (more platform independent).
 * MPI support has been added, thanks to Canrong Qiu (University of Alaska).
 * The model mag_refl can now:
   - Simulate energy scans.
   - Simulate "normal" x-ray reflectivity.
   - Simulate scans with polarisation analysis.
   - Use negative values of mag.
 * spec_nx and mag_refl can now simulate the asymmetry signal in neutron reflectivity.
 * Refactoring of the Reflectivity base models.
 * Numerous reported bugs fixed. (See http://sourceforge.net/p/genx/code/commit_browser
   for detailed changes).
