How to multiplay matrices in different dimensions?

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Lilja Dahl
Lilja Dahl 2019-6-6
评论： Lilja Dahl 2019-6-10
I would like to multiply a 3D matrice with a 2D matrice.
  1 个评论
Jan
Jan 2019-6-6
Then do this. Remember that this operation is not defined mathematically, so you have to explain which result you want. Do you mean a matrix multiplication, or an elementwise product?

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Jan
Jan 2019-6-6
编辑：Jan 2019-6-6
Perhaps:
a = rand(2,2,3);
b = [2, 2; 4, 4]
% Elementwise - auto-expanding since R2016b:
r = a .* b
% Matrix multiplication:
r = zeros(2, 2, 3);
for k = 1:3
r(:, :, k) = a(:, :, k) * b;
end
If the later is wanted, you can vectorize the code or use some tools from the FileExchange to avoid the loop.

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