Updates:
Status: Started
Owner: mattpap
Cc: -mattpap
Labels: Polynomial Milestone-Release0.7.0 NeedsReview
Comment #2 on issue 1790 by mattpap: unnecessarily restriction on monomial
ordering
http://code.google.com/p/sympy/issues/detail?id=1790
This restriction was removed in polys11 branch. Now a callable object (with
__call__ attribute) can be used as a value to 'order' argument. Note also
that the behaviour of 'order' was changed and now it uses key-functions
instead of cmp-functions, following paradigm switch in Python.
Example:
In [1]: Poly(x**2*y**3*z + x**2*y*z**3 + x*y*z + 1).terms(order='lex')
Out[1]: [((2, 3, 1), 1), ((2, 1, 3), 1), ((1, 1, 1), 1), ((0, 0, 0), 1)]
In [2]: rev_lex = lambda monom: tuple(reversed(monom))
In [3]: Poly(x**2*y**3*z + x**2*y*z**3 + x*y*z + 1).terms(order=rev_lex)
Out[3]: [((2, 1, 3), 1), ((2, 3, 1), 1), ((1, 1, 1), 1), ((0, 0, 0), 1)]
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