Finding a needle in a matrix

Hello,

Let's say I have a 10 x 10 matrix filled with numbers (10 X 10 double) which can only be 1, 2 or 3. I need a code that returns an error if there's any other number in there, like say a 4 or an 8. I would have thought that:

if Y ~=1|Y ~=2|Y ~=3

       disp('error')  

    return, 
end

would work but it always returns an error message. Any ideas?

Thank you

Answer 1

[the cyclist]

if not(all(ismember(Y(:),[1 2 3])))
  disp('error') 
end

[012786534]

That's great! Thank you!