matrix search and the save on a new matrix

Hi there. I have a 2 collumn ndm a couple thousand rows matrix. The first collumn has some number labels and the second collumn has zeros or ones. I want to locate the ones of the second collumn and save them with the corresponding labels on a new matrix. How can I do it? Regards

Answer 1

[Yao Li]

find(a(:,2)) can be used to find the index of the non-zero rows.