#18824: Add MultiPolynomialIdeal.groebner_basis("libgiac")
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Reporter: malb | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.8
Component: interfaces: | Resolution:
optional | Merged in:
Keywords: | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: public/giacpyGB | 86bd0a445cee318d3cca0fef87babf4118c910d8
Dependencies: | Stopgaps:
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Comment (by malb):
Replying to [comment:14 frederichan]:
> The sig_count pb is from giacpy 0.4.8 Pygen {{{__iter__}}}, it
could/should? be fixed in a separate trac?
yes, this should be a separate ticket but this ticket IMHO should depend
on that ticket. That is, this ticket should wait until the fix is in.
> we can avoid it with:
> {{{ return PolynomialSequence(P, tuple(gb_giac), immutable=True)}}}
> instead of just gb_giac. I remark time loss with tuple, should we adopt
this?
You mean instead of {{{PolynomialSequence(gb_giac, P, immutable=True)}}}?
I don't think we should work around a bug which should be fixed instead.
> is there a way to substitute efficiently variables in PolynomialRing
(ex: 'i' will give use troubles in giac) if not I will just add some
protection with an error message
You can try but it's not very fast:
{{{#!python
sage: P.<a,b,c,i> = QQ[]
sage: R.<x,y,z,w> = QQ[]
sage: f = P.random_element()
sage: R(f)
-2*y^2 - 1/4*y*z + 6*z*w - 2*z - 59/5
sage: %timeit R(f)
10000 loops, best of 3: 77.3 µs per loop
}}}
Maybe check {{{P.gens_dict().keys()}}} for problematic names and only
switch over if there is a problem?
--
Ticket URL: <http://trac.sagemath.org/ticket/18824#comment:16>
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