MATLAB: Matrices in a matrix

matrix manipulation

I have this matrix in which there are 9 different matrices each one is composed by 6 * 6 elements

I want pre and post multiply each matrix-elements in this way:

A is a matrix with the same size of R

P.S. : I have store R and A as a sparse matrices

How can I do?

Thanks

Best Answer

Hi UGO, should your top row read R11, R12, R13? at any rate, try

z = zeros(size(A));
C = [A z z;z A z;z z A];
B = C.'*R*C

where C is a block diagonal matrix.

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