Status: Accepted
Owner: asmeurer
CC: mattpap
Labels: Type-Enhancement Priority-High Polynomial
New issue 2031 by asmeurer: Add field option to Poly.operation() functions
http://code.google.com/p/sympy/issues/detail?id=2031
I mentioned this in comment 5 of issue 2010, and have also talked about it
in the mailing list. Poly can differ in it's behavior whether the input
polys have a field domain or ring domain. Examples of Poly methods that
differ in output for this are
div - Completely different results (see
http://groups.google.com/group/sympy/browse_thread/thread/3ddfc2f64bd29fb2#).
I recently fixed a bug with ratint() because it was calling div on Polys
with ring coefficients expecting the field variant.
quo - Fails for things like Poly(x, x).quo(Poly(2, x))
rem - The same as div
mul_ground - (polys11 only). The same issue as quo(). See issue 2010,
comment 5.
So I recommend that an option be added to each of these functions, so that
I can just do
Poly(x, x).quo(Poly(2, x), field=True)
and it will just work. Otherwise, right now, I have no easy way to do
<Poly with very complex ground coefficient>/<complex ground coefficient>
without doing
Poly(a.as_basic()/b.as_basic(), x)
which takes forever due to calling of expand on the ground coefficients.
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