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

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

Answer 1

[Roger Stafford]

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]

It worked. Thanks.