# ch7.7_noh

## 452 days ago by kyunganoh

A=matrix(QQ, 4, 4, [1,2,1,2,2,3,2,3,3,4,3,4,4,5,4,5]) A.echelon_form() #rref
 [1 0 1 0] [0 1 0 1] [0 0 0 0] [0 0 0 0] [1 0 1 0] [0 1 0 1] [0 0 0 0] [0 0 0 0]
A=matrix(QQ, 4, 4, [1,2,1,2,2,3,2,3,3,4,3,4,4,5,4,5]) A.echelon_form() print A.rank() #rank print A.right_nullity() #nullity
 2 2 2 2