Which Sage version are you using? This example works fine for me (under
Sage v6.7)
On 5 June 2015 at 20:50, David Perkinson wrote:
> sage: m = matrix([[2,-1,-1],[-1,2,-1],[-1,-1,2]])
> sage: Q = ZZ^3/m.row_space()
> sage: Q.0
> (1, 0)
> sage: Q.1
> (0, 1)
> sage: m = matrix([[3,-1,-1,-1],[-1,3,
sage: m = matrix([[2,-1,-1],[-1,2,-1],[-1,-1,2]])
sage: Q = ZZ^3/m.row_space()
sage: Q.0
(1, 0)
sage: Q.1
(0, 1)
sage: m = matrix([[3,-1,-1,-1],[-1,3,-1,-1],[-1,-1,3,-1],[-1,-1,-1,3]])
sage: Q = ZZ^4/m.row_space()
sage: Q.0
) failed:
AttributeError: 'sage.matrix.matrix_integer_sparse.Matrix_integ
