3D matrix manipulation. FInd values of given positions

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André Sousa
André Sousa on 8 May 2014
Answered: lvn on 8 May 2014
Hi there. Pls help me resolve an issue I cant find a solution for: I have a two 3D matrixes with the same dimentions( 288*288*80)off nii files. I want to search for nonzero positions on the first matrix and use thoses positions to go through the second matrix, and do a sum of the values located on those positions . How can I do it? Regards
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SkyRazor
SkyRazor on 8 May 2014
I think the page as follows will help you.
Try the functions nonzeros, find and sum to slove your problem.

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Accepted Answer

lvn
lvn on 8 May 2014
This should do it:
sum(matrix2(matrix1~=0))

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