MATLAB: How to use rref to check to see if the columns of a matrix span all of R^n

Question

I'm trying to use matlab to do some linear algebra, but I'm very confused as to how to check if the columns of my matrix are in the span R^n. I know I need to use rref but not much else! Thank you!

Answer 1

No, you wouldn't use rref(). You would use rank().