Comment #5 on issue 2010 by asmeurer: Integration with the full Risch
Algorithm
http://code.google.com/p/sympy/issues/detail?id=2010
Actually, .mul_ground() didn't work where I was going to use it:
In [1]: Poly(x*t, t).mul_ground(1/x)
…
PolynomialError: 1/x contains an element of the generators set
Which is because Poly(x*t, t) creates the domain ZZ[x]. By the time I go
through and make sure things have field domains everywhere, it's faster to
just do
b = Poly(b.as_basic()/a.as_basic(), t)
instead of
b = b.mul_ground(1/a)
I'm starting to think that most of the methods of Poly should allow a field
kwarg, so that
Poly(x*t, t).mul_ground(1/x, field=True)
would work. That would make things much easier than trying to find where
the Poly was originally created and putting in the field=True there, and
hoping that it remains by the time it gets to whatever line of code failed.
But other than that, stuff is working much better already.
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