3D Matrix Multiplication

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Rahul Marwaha
Rahul Marwaha 2021-2-24
评论： Masoud Aminzadeh 2023-8-6
Hi I have created two large matrices of which I have reshaped to create the following:
A = 3x1x4 double
B = 3x3x4 double
C = B * A ????
I was wondering how I could multiply each 3x3 matrix from B with each 3x1 matrix from A? The aim is to create a new 3x1x4 matrix in the end. Note: I don't have R2020b so don't have access to the pagemtimes function.
Any help is greatly appreciated, thanks!

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the cyclist
the cyclist 2021-2-24
编辑：the cyclist 2021-2-24
You can do it straightforwardly with a for loop:
% Some made-up input data
A = rand(3,1,4);
B = rand(3,3,4);
[mA,nA,pA] = size(A);
[mB,nB,pB] = size(B);
C = zeros(mB,nA,pA);
for np = 1:pA
C(:,:,np) = B(:,:,np) * A(:,:,np);
end

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Walter Roberson
Walter Roberson 2021-2-24

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