Creating specific matrix from other matrix?

Hi all. I have data matrix x(1x160) and It's columns contains 0 and 1 values. I want to create a matrix that shows whichs columns are 1.

For example, If x has 1 values on 6-15-20-22-30-90-112-155th columns,

created matrix should be = [6 15 20 22 30 90 112 155]

Do I need for loop for this?

Answer 1

[Roger Stafford]

   x2 = find(x~=0);