how to block diagonalize a 3D matrix

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Yue
Yue le 11 Jan 2013
Commenté : Timothy le 26 Jan 2016
how to blkdiag a 3D matrix. The blkdiag operation is done to 2D slice along dim 3

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Teja Muppirala
Teja Muppirala le 11 Jan 2013
R = rand(4,2,3);
M = mat2cell(R,4,2,ones(1,size(R,3)));
M = blkdiag(M{:})
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Timothy
Timothy le 26 Jan 2016
Hmm. Make that third dimension a lot bigger.
R = rand(4,2,65341); tic M = mat2cell(R, 4,2,ones(1, size(R,3))); toc
Elapsed time is 6.065165 seconds.
I was hoping to use blkdiag to perform a [3x2] * [2 x 1] calculation a whole bunch of times, P = 65341 times. For looping through takes 2.5s. Setting up the block diagonal in this way is much slower. Is there a faster way?

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