What condition to use for checking whether at least a single negative element in a array?

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Neil Sam
Neil Sam 2018-4-10
评论： Neil Sam 2018-4-10
For example, what condition to use instead of '<' to execute the content inside if (to check if whether at least a single negative entry exists)?
A=[1;-1];
B=[3;4];
if (A.*B < 0)
disp (A.*B)
end

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Roger Stafford
Roger Stafford 2018-4-10
编辑：Roger Stafford 2018-4-10
Use the 'any' logical function.
if any(A.*B<0)
If you are dealing with an array, C, of more than one dimension, do this:
if any(C(:)<0)

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