sine_transform, a MATLAB code which demonstrates some simple properties of the discrete sine transform for real data.
The code is not optimized in any way, and is intended instead for investigation and education.
sine_transform is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
cosine_transform, a MATLAB code which demonstrates some simple properties of the discrete cosine transform (dct).
fft_serial, a MATLAB code which demonstrates the computation of a fast fourier transform, and is intended as a starting point for implementing a parallel version.
haar, a MATLAB code which computes the haar transform of data.
sftpack, a MATLAB code which implements the "slow" fourier transform, intended as a teaching tool and comparison with the fast fourier transform.
walsh, a MATLAB code which implements versions of the walsh and haar transforms.
wavelet, a MATLAB code which does some simple calculations with wavelet transforms;