Check if all vector elements have same sign

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Oscar Frick
Oscar Frick 2018-5-31
评论： Oscar Frick 2018-6-1
Is there an efficient (and easy) way to check if all elements of a vector have the same sign (not caring about zero values)?
I can think of applying sign(v) and checking if all elements is equal to the first one after having removed all elements where sign(v)==0, but this fells somewhat clumsy. Is there an easier or more efficient way?

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Stephen23
Stephen23 2018-5-31
编辑：Stephen23 2018-5-31
true if all non-zero elements of V have the same sign:
~any(diff(sign(V(V~=0))))

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