How to efficiently calculate a weighted sum of 3 dimensional matrix through a vector in matlab
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Hancheng Zhu
el 17 de Nov. de 2023
Comentada: Matt J
el 20 de Nov. de 2023
A is a 3 dimensional matrix (M*N*K), b is a vector with length K. I need to calculate
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1542397/image.png)
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Matt J
el 20 de Nov. de 2023
@Hancheng Zhu If that means you've settled on one of the answers below, please Accept-click one of them.
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Bruno Luong
el 17 de Nov. de 2023
Editada: Bruno Luong
el 17 de Nov. de 2023
This uses matrix multiplication so it should be well optimized and fast.
[m,n] = size(A, [1 2]);
C = reshape(A,m*n, []) * B(:);
C = reshape(C, m, n);
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