3-D matrices

Question

Ricky 2012-5-8

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Hi there,

I wonder if anyone could tell me how to do the following:

- if I have a 3d matrix r is 10x200x100, and I want to find correlation of it which define as R = r*conj(r'). how do I do that? if I just put that equation in MATLAB it won't work as I wanted. Technically, I want R to be 10x10x100.

Cheers,

Rak

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Answer 1

Wayne King 2012-5-8

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在 MATLAB Online 中打开

   R = randn(10,200,100);
   for nn = 1:100 
   Rxx(:,:,nn) = R(:,:,nn)*R(:,:,nn)'; 
   end

If R has complex elements, then R' conjugates the elements so I was not sure what you meant by conj(R'), did that mean you did not want to take the conjugate? If that is the case, do R(:,:,nn).'

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Ricky 2012-5-8

sorry I mean to write conj(r.') which is Hermitian transpose and which I just realize that you can just do r' which is the same. but anyway, that's not the point here, the point here is 3D matrix multiplication. I think your answer is right, but since I'm trying simplify my program to run faster, I tend not to use the 'for-loop' So is there any way you can do that without the knowledge of 'for-loop'?

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