[sage-support] Problem extracting matrix from term order

[Jeff Stroomer]

I installed sage 4.7 a moment ago, and am running into a problem with
term orders defined using matrices.  The following works correctly:

    T = TermOrder(identity_matrix(2))
    R = PolynomialRing(GF(101), names = 'x, y', order = T)
    print R.term_order().matrix()

But if I negate the matrix, I run into a problem:

    T = TermOrder(-identity_matrix(2))
    R = PolynomialRing(GF(101), names = 'x, y', order = T)
    print R.term_order().matrix()

    Traceback (most recent call last):
      File "yyy.py", line 6, in <module>
        print R.term_order().matrix()
      File "/Applications/sage/local/lib/python2.6/site-packages/sage/
rings/polynomial/term_order.py", line 1160, in matrix
        return matrix(self.__matrix)
      File "/Applications/sage/local/lib/python2.6/site-packages/sage/
matrix/constructor.py", line 650, in matrix
        raise ValueError, "Invalid matrix constructor.  Type matrix?
for help"
    ValueError: Invalid matrix constructor.  Type matrix? for help

Thanks for the help,

Jeff Stroomer

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