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Welcome to the CLASS public repository wiki!

This is not the same as the CLASS webpage nor the online html documentation.

For simplicity

Please use Anaconda, which is a Python distribution with graphical installer, and a package manager, that will play nicely with Mac OS X, and remove a lot of problems.

Note that you might encounter an error that reads ValueError: unknown locale: UTF-8 when launching ipython. Please paste these two lines:

export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8

at the end of your file ~/.bash_profile.

If you know what you are doing, and/or are on a Linux, you can of course use the Python distribution you want.

Table of contents

• Detailed instructions on how to install the code, including notes about installing on Mac OS X 10.9+ and the clang compiler.
• You can find more information on the Python wrapper.
• Problems at compilation, and you don't understand the error message? See the frequently asked questions, and search for the error message.

Branches

On this CLASS public repository, you will find only a limited number of branches:

• the master branch contains the latest release (corresponding to a version tag, e.g. v2.7.3)
• some intermediate commits between two tagged versions can be found in the branch x.y with the highest number xy (e.g. 2.7). It might contain a few more bug fixes than the master branch.
• the ExoCLASS branch contains new modules and features for models with exotic energy injection, including the DarkAges module, as described in Exotic energy injection with ExoCLASS: Application to the Higgs portal model and evaporating black holes, by P. Stöcker, M. Krämer, J. Lesgourgues, V. Poulin, JCAP 1803 (2018) 018, arXiv:1801.01871
• the class_matter branch contains a parallel version computing large scale structure CL's with the FFTlog method of the paper Beyond the traditional Line-of-Sight approach of cosmological angular statistics, by N. Schöneberg, M. Simonovic, J. Lesgourgues, M. Zaldarriaga, JCAP 1810 (2018) 047, arXiv:1807.09540. It incorporates a module for the pre-computation Bessel integrals, and it is provided with an illustrative input file matter.ini. Most new features are located in the new module matter.c

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• If you want to contribute to the code, please look at the instructions