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...

mathematician Jacques Hadamard or German mathematician Issai Schur. The Hadamard product is associative and distributive. Unlike the matrix product, it is also...

the sum of the entries of the Hadamard product Hadamard product of two matrices of the same size, resulting in a matrix of the same size, which is the...

2m × 2m matrix, the Hadamard matrix (scaled by a normalization factor), that transforms 2m real numbers xn into 2m real numbers Xk. The Hadamard transform...

of Hadamard matrices where the rows are rearranged so that the number of sign changes in a row is in increasing order. In short, a Hadamard matrix is...

A complex Hadamard matrix is any complex N × N {\displaystyle N\times N} matrix H {\displaystyle H} satisfying two conditions: unimodularity (the modulus...

The Hadamard code is an error-correcting code named after Jacques Hadamard that is used for error detection and correction when transmitting messages over...

recursive definition of the 2 m × 2 m {\displaystyle 2^{m}\times 2^{m}} Hadamard matrix H m {\displaystyle H_{m}} : H m = 1 2 ( H m − 1 H m − 1 H m − 1 − H...

Hadamard's maximal determinant problem, named after Jacques Hadamard, asks for the largest determinant of a matrix with elements equal to 1 or −1. The...

opposite of irregular matrix, a matrix with a different number of entries in each row Regular Hadamard matrix, a Hadamard matrix whose row and column sums...

lengths of these vectors ||vi ||. Specifically, Hadamard's inequality states that if N is the matrix having columns vi, then | det ( N ) | ≤ ∏ i = 1 n...

is a Hadamard matrix of size 2(q + 1). It is a symmetric Hadamard matrix. Applying Paley Construction I to the Jacobsthal matrix for GF(7), one...

\circ } represents the Hadamard product and 1 {\displaystyle \mathbf {1} } is a constant vector with elements 1. The inverse matrix-to-vector diag {\displaystyle...

mathematics a regular Hadamard matrix is a Hadamard matrix whose row and column sums are all equal. While the order of a Hadamard matrix must be 1, 2, or a...

Bloch sphere, and is therefore involutory. It is represented by the Hadamard matrix: H = 1 2 [ 1 1 1 − 1 ] . {\displaystyle H={\frac {1}{\sqrt...

matrix, from the usual O ( N 2 ) {\displaystyle O(N^{2})} . Similar techniques can be applied for multiplications by matrices such as Hadamard matrix...

multiplication also exist, such as the Hadamard product and the Kronecker product. They arise in solving matrix equations such as the Sylvester equation...

{\displaystyle Trs} matrix using Hadamard product, (denoted by ∘ {\displaystyle \circ } ) of Tr matrix and n-dimensional Hadamard matrix whose rows (except...

the m × m identity matrix. An Hadamard matrix can be put into standardized form (that is, converted to an equivalent Hadamard matrix) where the first row...

respect to this basis can be represented by the columns of a complex Hadamard matrix multiplied by a normalization factor. For d = 3 these matrices would...

In mathematics, a complex Hadamard matrix H of size N with all its columns (rows) mutually orthogonal, belongs to the Butson-type H(q, N) if all its elements...

The pseudo-Hadamard transform is a reversible transformation of a bit string that provides cryptographic diffusion. See Hadamard transform. The bit string...

integrand with the help of the Hadamard lemma one can obtain the following useful expression for the derivative of the matrix exponent, ( d d t e X ( t )...

In mathematics, the Hadamard product may refer to: Hadamard product of two matrices, the matrix such that each entry is the product of the corresponding...

the determinant of W {\displaystyle W} . A weighing matrix is a generalization of Hadamard matrix, which does not allow zero entries. As two special cases...

the m × m identity matrix. An Hadamard matrix can be put into standardized form (that is, converted to an equivalent Hadamard matrix) where the first row...

existence of (0,1)-matrices with given row and column sums Hadamard matrix, a square matrix of 1 and –1 coefficients with each pair of rows having matching...

2) if and only if there exists a Hadamard matrix of order 4λ. To proceed in one direction, let H be a Hadamard matrix of order 4m in standardized form...

matrices used in mathematics, science and engineering. A matrix (plural matrices, or less commonly matrixes) is a rectangular array of numbers called entries...

Hadamard may refer to: Zélie Hadamard (1849–1901), French actress Jacques Hadamard (1865–1963), a French mathematician, whose name is associated with the...