Find non-zero elements in a 3-D matrix

2013 7 11
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更新时间：2021 12 20
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Hi,
I have a 3-D matrix containing some non-zero numerical values.I want to find the indices of these non-zero elements.
I know find() can give me row and column, but it doesn't work for a 3-D matrix. Is there another function I can use?

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Mehri Mehrnia
Mehri Mehrnia 2021-12-20
You can use nnz(matrix), it gives you number of all non-zero elements.

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Jan
Jan 2013-7-11

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Why do you assume, that find() does not work for 3D arrays? Of course it does work. When used with a single output, it replies the linear index. Using this is faster than the 3 separated indices, but you can use ind2sub for a conversion:
ind = find(A);
[i1, i2, i3] = ind2sub(size(A), ind);

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