Comment #109 on issue 1598 by mattpap: New polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=1598
I see that teresm_gcd will take an expr or a list
It does not allow lists. What you did with terms_gcd(*l) is you computed
terms_gcd()
of l[0] with generators l[1:].
In addition, perhaps powers could be returned unchanged and Mul's
returned as Muls
with perhaps further gcd'ing only, so instead of
Just use expand=False with polynomial manipulation functions. Note that
case when
generators are Add instances is not yet handled well.
And what about extracting numbers like factor does? Is that just a matter
of
returning terms_gcd's result unevaluated?
Yes, as always with current core. This works (as expected):
In [14]: terms_gcd(4*x + 2*x**2)
Out[14]: 2⋅x⋅(2 + x)
I will add evaluate=False hack to terms_gcd() and hope that someone will
find time
time to get rid of this automatic distribution of constants or at least fix
related
problems.
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