libftsh
A Fast Transform for Spherical Harmonics

This library of C routines implements a fast transform for spherical harmonics. It is free under the terms of the GNU General Public License.
Algorithm and code by Martin J. Mohlenkamp. Originally released October 2000.
Download libftsh.tar.
To get started, look at the README file and then the TEST/README file.
This material is based upon work supported by the National Science Foundation.