if statements

I have a set of data with 996 columns and 998 rows. Could I construct if statements so that each column returns 0 if all values are positive or all values are negative, and 1 if there is some combination of the two?

Answer 1

[the cyclist]

A = rand(998,996); % Use your data in place of A
B = not(all(A>0) | all(A<0));

[bobby]

thank you so much, what if I wanted to differentiate the values that return one now, like return +1 if the very first value is positive and negative 1 if they first value is negative?