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multiplication of a 3-D matrix by a 1-D array

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yi yang
yi yang 2022-10-8
编辑： Stephen23 2022-10-11
I have a 3-D matrix A = rand(sz1,sz2,sz3) and a 1-D array B = rand(1,sz3).
Is there a biult-in function to do the muliplication like:
C with dimensions of (sz1,sz2,sz3)
for ii = 1:sz3
C(:,:,ii)=A(:,:,ii)*B(ii);
end

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Stephen23
Stephen23 2022-10-8
You don't need a special kind of multiplication, you just need to match the vector orientation to the array:
C = A .* reshape(B,1,1,[])
  2 个评论
yi yang
yi yang 2022-10-8
Thanks for your reply. It works.
I checked the matlab documentation for .* and did not find an answer for the question below.
In your answer, the 2 matrices have different dimensions and the element-wise multiplication works, why?
Stephen23
Stephen23 2022-10-11
编辑：Stephen23 2022-10-11
"I checked the matlab documentation for .* and did not find an answer for the question below."
The TIMES documentation states:
"In your answer, the 2 matrices have different dimensions and the element-wise multiplication works, why?"
Clicking the link given in the TIMES documentation takes you to this page:
https://www.mathworks.com/help/matlab/matlab_prog/compatible-array-sizes-for-basic-operations.html

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