How to find positive values in 1500 matrices(720*1280)?

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Wenyi Xiao
Wenyi Xiao 2019-4-26
回答： Matt J 2019-4-26
WeChat Screenshot_20190426114417.png
I've got a data like this. Each file contains zero and some positive values or all zeros.
I want to find which matrix contains positive values.

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回答（2 个）

Matt J
Matt J 2019-4-26
If C is your cell array
find(cellfun(@nnz,C))
KSSV
KSSV 2019-4-26
If A is your matrix.
idx = A>0 ; % this gives indices of posittive values
idx = sign(A) % this gives sign of values in A
A(A>0) % this gives values in A which are greater than 0
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Wenyi Xiao
Wenyi Xiao 2019-4-26
I want to keep n matrices that contains positive integers.
so there will be n*1 cell. Each contains 720*1280.
Do you know how?

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