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You have got a couple of multi-dimensional matrices, A and B. And want to multiply them. For the first 2 dimensions, an ordinary matrix multiplication applies. And in the other dimensions? Well, they just act as parallel worlds. All 2D matrices are multiplied, for every element in the other dimensions. You may assume that the size in the 1st two dimensions allows simple matrix multiplication: A(:,:,1)*B(:,:,1), so size(A(:,:,1),2) == size(B(:,:,1),1), or either A(:,:,1) is a scalar or B(:,:,1) is a scalar. In the other dimensions, the sizes of A and B should be eqaal, size(A,n) == size(B,n), for n>2, or either ndims(A)<n or ndims(B)<n, or either size(A,n)==1 or size(B,n)==1, so one of them is a scalar.

Write a function `mtimesm` that does this, and ask Mathworks to include it in the `elmat` toolbox of the Next Release.

10 correct solutions
16 incorrect solutions

Last solution submitted on Feb 11, 2015

2 players like this problem

1 Comment

bainhome
on 9 Feb 2015 at 8:30

shame on myself.I must get a real answer soon.

3 Comments