wavelet, a FORTRAN77 code which contains some utilities for computations involving wavelets.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
wavelet is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version.
fftpack5, a FORTRAN90 library which implements the Fast Fourier Transform by Swarztrauber and Valent;
haar_transform, a FORTRAN77 library which computes the Haar transform of data.
sftpack, a FORTRAN77 library which implements the slow Fourier transform, intended as a teaching tool and comparison with the fast Fourier transform.
sine_transform, a FORTRAN77 library which demonstrates some simple properties of the discrete sine transform.
WALSH, a FORTRAN77 library which implements versions of the Walsh and Haar transforms.