Matrices in a matrix

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UGO mela
UGO mela 2017-5-15
编辑： Stephen23 2017-5-15
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

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采纳的回答

David Goodmanson
David Goodmanson 2017-5-15
编辑：David Goodmanson 2017-5-15
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.

更多回答（1 个）

John
John 2017-5-15
try
% if A is 6x6
A = rand(6);
A = repmat(A,3);
% if R is 18x18, constructed from multiple 6x6 sub Rij matrices
B = A'*R*A

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