checking conditions on 2 arrays

I have 2d array X of size (750, 450) and another array Y of size(750, 450).

I want to check where there is 0 in X, if there is also 0 in Y.

any one liners?

Answer 1

[Walter Roberson]

mask = ~X & ~Y;

this will be true only in places where X and Y are both exactly 0.

You might prefer to code

mask = (X == 0) & (Y == 0);

and indeed you need that if your arrays might have nan in them as the ~ operator does not work on nan.