Quickly generate the cartesian product of a matrix

Question

Let\'s say I have a matrix x which contains 10 rows and 2 columns. I want to generate a new matrix M that contains each unique pair of rows from

Answer 1

I'm not quite grokking what you are doing so I'll just throw out something that may, or may not help.

Here's what I think of as the Cartesian product of the two columns:

expand.grid(x[,1],x[,2])