How to find which postions in a vector has negative values and output them?

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sairohith mudduluru
评论： Stephen23 2018-2-19
i have a vector and need to find the postions which has negative values

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Birdman
Birdman 2018-2-17
编辑：Birdman 2018-2-17
Say your vector is A:
idx=find(A<0)
ANeg=A(idx)

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Stephen23
Stephen23 2018-2-17
find is not required, logical indexing is simpler and more efficient:
B = A(A<0)

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