How to vectorize the following code snippet ?

M = randi([-10 10],10,10);

[m, n] = size(M);

out = zeros(m, n);

for x = 1:m

for y = 1:n

if M(x, y) > 0

out(x, y) = 1;

else if M(x, y) == 0

out(x, y) = 0;

else

out(x, y)=-1;

end

end

end

Answer 1

[Star Strider]

That can all be reduced to:

out = zeros(size(M))-1;
out(M>0)  = 1;
out(M==0) = 0;

producing the same result.