cellfunc -multiplication of two cells

Question

RoboKid 2013-11-15

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回答： sixwwwwww 2013-11-15

how to multiply two cells let's say:D = {[1 2 ] , [1 3] ; [1 6] , [5 2] } L={[1],[0],[0],[0];[0],[1],[0],[0]}

I want to do L*D how do I do that? --Thanks

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Answer 1

Walter Roberson 2013-11-15

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What answer are you expecting?

L is 2 x 4 with each element 1 x 1, so most likely L should be considered to be like a 2 x 4 matrix.

D is 2 x 2 with each element 1 x 2. One of the ways to view that would be as a 2 x 4 matrix.

But if one views this as a (2 x 4) * (2 x 4) then the "*" operator must fail because the inner dimensions do not agree.

I am going to speculate that you asked the wrong question and that what you want is L .* D

cell2mat(L) .* cell2mat(D)

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Answer 2

sixwwwwww 2013-11-15

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Dear Mihnathul, I completely agree with Walter. Your question is not completely clear, however if you really insist to use cellfun for this purpose then maybe you can try something like this:

if prod(size(L)) >= prod(size(D))
    Mat = cellfun(@times, num2cell(reshape(cell2mat(D), size(L, 1), size(L, 2))), L);
else
    Mat = cellfun(@times, D, num2cell(reshape(cell2mat(L), size(D, 1), size(D, 2))));
end
disp(Mat)

The code is nothing in itself. Just it is making dimensions of 2 cell arrays equal so that you can use cellfun. I hope it helps. Good luck!