3D matrix manipulation. FInd values of given positions

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André Sousa
André Sousa 2014-5-8
回答： lvn 2014-5-8
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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lvn
lvn 2014-5-8
This should do it:
sum(matrix2(matrix1~=0))

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