#4376: Implement conversion of power series over more rings (e.g. GF(p)) to pari
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Reporter: cremona | Owner: was
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.6.2
Component: interfaces | Keywords: power series pari
gp
Author: Francis Clarke, Jeroen Demeyer | Upstream: N/A
Reviewer: Marco Streng | Merged:
Work_issues: |
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Changes (by mstreng):
* status: needs_review => needs_work
Old description:
> [email protected] would like to be able to do linear algebra over
> {{{GF(p)[[X]]}}} using pari, but currently conversion of power series in
> {{{R[[X]]}}} to pari is only implemented when R=QQ or R=ZZ (via strings).
>
> We should improve the _pari_() function for power series rings to allow R
> to be any ring in which pari conversion is already defined.
New description:
[email protected] would like to be able to do linear algebra over
{{{GF(p)[[X]]}}} using pari, but currently conversion of power series in
{{{R[[X]]}}} to pari is only implemented when R=QQ or R=ZZ (via strings).
We should improve the _pari_() function for power series rings to allow R
to be any ring in which pari conversion is already defined.
Depends on #7644
--
Comment:
On lines 316 and 317 of sage/rings/polynomial/polynomial_ring.py, you
write
{{{
except (NotImplementedError, ValueError):
raise TypeError, "denominator must be a unit"
}}}
I don't think a {{{NotImplementedError}}} should lead to a
{{{TypeError}}}: that would give a lot of confusion.
Otherwise, this all looks very good.
(this ticket now depends on #7644)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4376#comment:13>
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