echelonr(a)
Returns the reduced echelon form of matrix a.
See also echelon solven nullspace
Example
a = ( 1, 2, 3 ; 4, 5, 6 ; 7, 8, 9 )
1 2 3
4 5 6
7 8 9
echelonr( a )
1 0 -1
0 1 2
0 0 0