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

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

Answer 1

[Stephen23]

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,[])

[yi yang]

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]

"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