Issues in Matrix multiplication

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Nikolaos Zafirakis
Nikolaos Zafirakis 2019-4-16
编辑： Matt J 2019-4-16
I have 100 6 by 6 matrices and 100 6 by 1 matrices and I want to multiply them. If I do X=A.*B it does not give me the correct solution. Does anyone know a way around this?

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回答（2 个）

Matt J
Matt J 2019-4-16
编辑：Matt J 2019-4-16
A somewhat less efficient solution (but which uses no 3rd party files) is,
A=rand(6,6,100);
B=rand(6,1,100);
C=sum( A.*reshape(B,1,6,[]) ,2);
Matt J
Matt J 2019-4-16
编辑：Matt J 2019-4-16
Use mtimesx from the File Exchange
https://www.mathworks.com/matlabcentral/fileexchange/25977-mtimesx-fast-matrix-multiply-with-multi-dimensional-support
Example:
A=rand(6,6,100);
B=rand(6,1,100);
C=mtimesx(A,B);

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