Element wise if then in vector

Hi,

I have searched for this but found no answer. I have two arrays M1 and M2 , each with million+ elements.

I want to implement this logic and create a new vector S from each element of M1 and M2

S (i) = 0 if abs(M1(i)-M2(i))< Theta S(i) = sign(M1(i)-M2(i)) otherwise

For loops take forever on this. Any solution that makes it more vector operations would be great.

Vamsi

Answer 1

[Vamsi]

I seem to have hit the answer, please do let me know if there is an issue I didn't see. created a T = M1-M2 , initiate S = zeros(length(M1),1).

Then S(ABS(T)>Theta)=sign(T(ABS(T)>Theta))

[Simon]

That's it!

[Andrei Bobrov]

T = M1 - M2;
S = zeros(numel(M1),1);
l = abs(T) >= Theta;
S(l) = sign(T(l));