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5 votes
2 answers
189 views

Bisymmetric Hadamard matrices

Definitions: An $n\times n$ Hadamard matrix is a matrix whose entries are either $1$ or $−1$ and whose rows are mutually orthogonal. A symmetric matrix is a square matrix that is equal to its own ...
3 votes
0 answers
148 views

Linear combinations of special matrices

I am a hobby computer scientist and I have a problem to which I am searching an efficient algorithm. Given an integer n, we want to combine some square input-matrices of size n in a way that is ...