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

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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

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)

Neil Sam 2018-4-10

It worked. Thanks.

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