How to multiply Multidimensional Arrays with a column vector
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I want to multiply A with B so that C(:,:,1) is equal to A(:,:,1)*B(1) and C(:,:,2) is equal to A(:,:,2)*B(2)
>> A = cat(3, [2 8; 0 5], [1 3; 7 9])
A(:,:,1) =
2 8
0 5
A(:,:,2) =
1 3
7 9
>> B=[1 2]'
B =
1
2
I'm looking to get this:
>> C=???
C(:,:,1) =
2 8
0 5
C(:,:,2) =
2 6
14 18
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Answers (3)
sixwwwwww
on 28 Oct 2013
Edited: sixwwwwww
on 28 Oct 2013
Dear Tristan, here is the code which performs the task:
A = cat(3, [2 8; 0 5], [1 3; 7 9]);
B=[1 2]';
for i = 1:length(B)
C(:, :, i) = B(i) * A(:, :, i);
end
disp(C)
I hope it helps. Good luck!
5 Comments
Shambhavi Singh
on 14 Feb 2019
This should work too
C=A.*permute(B,[3 2 1]),3);
Permute switches the rows in B (So the elements of a column vector) with the third dimension
Pavel Chmelar
on 12 Jan 2016
Clear Matlab solution according sixwwwwww and Tristan:
B=zeros(1,1,2);
B(:)=[1,2];
C=bsxfun(@times,A,B);
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