In mathematics, a Hadamard matrix, named after the French mathematician Jacques Hadamard, is a square matrix whose entries are either $+1$ or $−1$ and whose rows are mutually orthogonal.
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Fast calculation of the Hadamard transform of a 4X4 matrix
I'm reading a book envolves Hadamard transformations, and in one of the examples they are trying to reconstruct Y from RX+Z where all are 4X4 matrixes.
R is given by:
R= 1/4 * \begin{array}{l}5&3&3&-3\\3&5&-3&3\\3&-3&5&3\\-3&3&3&5\end{array}
And…
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