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Hadamard transform
The Hadamard transform (also known as the Walsh-Hadamard transform, the Walsh transform, or the Walsh-Fourier transform) is an example of a generalized class of Fourier transforms. It is named for the French mathematician Jacques Hadamard, and performs an orthogonal, symmetric, involutary, linear operation on 2^m real numbers (or complex numbers, although the Hadamard matrices themselves are purely real).
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