remove obsevations with x=0

I have a pair of observations I just want to choose the pairs that . Is there any simpler way than writing a loop?

Answer 1

[KSSV]

Let A be your 100*2 data. With first column as x and second column as y.

idx = A(:,1)>0 ;  % get logical indices of x which are > 0
iwant = A(idx,:) ;