WALSH
Walsh and Haar Transforms


WALSH is a C library which implements versions of the Walsh and Haar transforms.

Note that the programs, as printed in the reference, had a few typographical errors. Several programs, in particular FHT and FRT, could not be made to perform as described in the text, and hence have been omitted.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

WALSH is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

HAAR, a C library which computes the Haar transform of data.

SFTPACK, a C library which implements the "slow" Fourier transform, intended as a teaching tool and comparison with the fast Fourier transform.

SINE_TRANSFORM, a C library which demonstrates some simple properties of the discrete sine transform.

WAVELET, a C library which does some simple calculations with wavelet transforms;

Reference:

  1. Ken Beauchamp,
    Walsh functions and their applications,
    Academic Press, 1975,
    ISBN: 0-12-084050-2,
    LC: QA404.5.B33.

Source Code:

Examples and Tests:

List of Routines:

You can go up one level to the C source codes.


Last revised on 17 March 2011.