How to sort a matrix so that sorting a column will make changes to corresponding other columns??

Lets say that my matrix is

[ x3   y3
  x1   y1
  x2   y2]

I want to sort the second column y in ascending order so that the respective 1'st column is also sorted accordingly. I want the output to be like this:

[ x1   y1
  x2   y2
  x3   y3]
How do I do that?

Answer 1

[Mischa Kim]

Nathan, use the sortrows command.

[Emmanuel]

Thanks!