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Multiply each 3D gpuArray page column with each other

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Hello to All, Can anyone give advice on the following matter? Lets say I have 3D gpuArray a (XxYxZ) with random numbers, I need to multiply every column of each page with other columns. A dumb version would look something like this:
D=pagefun(@times,a(:,1,:),a(:,1:end,:));
As you can see here only first column would be multiplied with others, but I need all columns. And yes I understand that this code does not work, it is just an example of what I am trying to achieve. Multiply each 3D gpuArray page column with each other

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Accepted Answer

Joss Knight
Joss Knight on 12 Jul 2018
It's hard to be sure whether you are literally after what you wrote, or whether you have just articulated it wrong. If you literally just want to multiply every column of a by every other column, then you don't need pagefun, because this is an element-wise operation. You can just use scalar dimension expansion.
[r, c, p] = size(a);
D = reshape(a, r, 1, c, p) .* reshape(a, r, c, 1, p);

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