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Development has moved

This repository has been archived and is only kept so that packages depending on it have a cacnonical place to download the last version.

For new projects using spherical harmonic transforms we recommend to use

Both of the above libraries are successors to libsharp which are significantly faster than the last libsharp version available here. Since the switch to the new algorithms required slight changes to the API, we decided to develop them in separate repositories and keep the original libsharp repository unchanged.

Libsharp

IMPORTANT NOTE: It appears that the default branch upon cloning from github.com/dagss/libsharp was an outdated 'dagss' branch instead of the 'master' branch. To get the latest copy, please do git checkout master; git pull. New clones are no longer affected.

Paper

https://arxiv.org/abs/1303.4945

Compilation

GNU make is required for compilation.

Libsharp compilation has been successfully tested with GNU and Intel compilers. When using gcc, version 4.x is required [1]. Since libsharp was written in standard C99, other compilers should work fine, but SSE2/AVX support will most likely be deactivated.

If you obtained libsharp directly from the git repository, you will also need a copy of the GNU autotools. In this case, run "autoconf" in libsharp's main directory before any other steps. For libsharp releases distributed as a .tar.gz file, this step is not necessary.

Afterwards, simply run "./configure"; if this fails, please refer to the output of "./configure --help" for additional hints and, if necessary, provide additional flags to the configure script. Once the script finishes successfully, run "make" (or "gmake"). This should install the compilation products in the subdirectory "auto/".

Documentation can be created by the command "(g)make doc". However this requires the doxygen application to be installed on your system. The documentation will be created in the subdirectory doc/.

[1] Some versions of the gcc 4.4.x release series contain a bug which causes the compiler to crash during libsharp compilation. This appears to be fixed in the gcc 4.4.7 release. It is possible to work around this problem by adding the compiler flag "-fno-tree-fre" after the other optimization flags - the configure script should do this automatically.