Bernadette . PERRIN-RIOU on Sat, 11 Jan 2003 06:16:03 +0100 (MET)


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Re: the problem of inversing a big boolean matrix 

A64 = [mattranspose(A), A; A,A]  define a matrix of matrices. Use

A64=concat(concat(A~,A)~,concat(A,A)~)~;
A2=Mod(A64,2);

A2*A2^(-1)

Bernadette