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Multiply all pages of a matrix

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souperman1985
souperman1985 on 15 Jan 2021
Answered: Bruno Luong on 15 Jan 2021
I have a 2x2xn matrix and I want to multiply all pages together. I know I can do it using a loop. Is there any way that does NOT require looping, however? Thanks!
aMat=reshape(1:20,[2,2,5])
bMat = aMat(:,:,1)*aMat(:,:,2)*aMat(:,:,3)*aMat(:,:,4)*aMat(:,:,5)
cMat = eye(2);
for i=1:size(aMat,3)
cMat = cMat*aMat(:,:,i);
end
cMat

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Accepted Answer

Bruno Luong
Bruno Luong on 15 Jan 2021
AFAIK there is no alternative way in general; unless your matrices has special property that can use some simplification.

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