Matlab: Remove IF-ELSE Conditional statements using Logical Indexing

Question

I don't understand precisely how I would do this question without using if statements or loops.

n = input ('What is the vector length? ');
y = rand(n,1);
x = rand(n,1);
p = zeros(n,1);
for i=1:n
    if (y(i) > 0.5 && x(i) < 0.5) || y(i) < 0.2
        p(i) = y(i) + x(i);
    else
        p(i) = (y(i)*x(i))^2
    end
end

a) Reimplement the code using only vector operations and logical indexing (i.e., you cannot use any loops or branches).

Answer 1

This way and you won't be needed to initialize p -

cond1 = (y > 0.5 & x < 0.5) | y < 0.2;
p = cond1.*(y + x) + ~cond1.*((y.*x).^2)