Please help with this multiplication problem

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Jianwei Tu
Jianwei Tu 2025-3-5
评论： Matt J 2025-3-5
Hi folks,
We know that a 1 x n array times an m x 1 array gives an n x m matrix. I have a 1 x n x r matrix and a m x 1 x r matrix. Is there a way to do the multiplication of the two such that it gives me an m x n x r 3D matrix?
Thanks!
Jianwei
  2 个评论
Matt J
Matt J 2025-3-5
We know that a 1 x n array times an m x 1 array gives an n x m matrix.
That is not correct. Perhaps you mean an mx1 array times a 1xn array gives an mxn matrix.

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采纳的回答

Matt J
Matt J 2025-3-5
编辑：Matt J 2025-3-5
Ran in:
You can multiply directly. Example:
[m,n,r]=deal(3,4,2);
A=rand(m,1,r);
B=rand(1,n,r);
C=A.*B;
whos A B C
Name Size Bytes Class Attributes A 3x1x2 48 double B 1x4x2 64 double C 3x4x2 192 double
  2 个评论
Jianwei Tu
Jianwei Tu 2025-3-5
编辑：Jianwei Tu 2025-3-5
Great!
Been using the .* for a while, but did not realize you could use it such way.
Thanks!
Matt J
Matt J 2025-3-5
You're welcome, but please Accept-click the answer to indicate that it worked.

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