How to check if a 3d matrix has any 2D submatrix with non zero elements?

2014 5 30
2 个回答
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更新时间：2014 5 30
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1 个投票

Hi all,
I have a 3D matrixnd I need to check if it has any sub 2D matrix with non zero elements.
a(:,:,1) =
0 0
0 0
a(:,:,2) =
1 0
0 0
the results should be
[0 1].
Thanks
cheers

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Sean de Wolski
Sean de Wolski 2014-5-30

1 个投票

pagesWithNonZeros = squeeze(any(any(x,1),2))
You can pass dim into any to test if there are any nonzero elements in that dimension.

更多回答（1 个）

Hugo
Hugo 2014-5-30

0 个投票

You can just do
[any(any(a(:,:,1)>0)),any(any(a(:,:,2)>0))]
or just shorter
nonzero2D=@(a,k)any(any(a(:,:,k)>0))
[nonzero2D(a,1), nonzero2D(a,2)]
Is that what you want?

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