#18589: isogeny efficiency improvement
-------------------------+-------------------------------------------------
Reporter: | Owner:
cremona | Status: positive_review
Type: | Milestone: sage-6.8
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Jeroen Demeyer
elliptic curves | Work issues:
Keywords: | Commit:
isogeny | 3d687e5225f67808eb6c5af5fbf4cb93f2000c62
Authors: John | Stopgaps:
Cremona |
Report Upstream: N/A |
Branch: |
u/cremona/18589 |
Dependencies: |
-------------------------+-------------------------------------------------
Comment (by cremona):
Replying to [comment:51 jdemeyer]:
> Replying to [comment:50 cremona]:
> > yet a single run of E.isogenies_prime_degree(89) is stil running after
14 hours
>
> Can you interrupt (CTRL-C) it and look at the traceback to see what it's
doing?
As expected: it is in the lines
{{{
-> 1939 if mult(S[-1]) == f:
}}}
and
{{{
-> 1928 return gcd(F(f(m(x)).numerator()),psi_l).monic()
}}}
and
{{{
-> 1588 return a.gcd(b, **kwargs)
}}}
and below that
{{{
/usr/local/sage/sage-2/src/sage/rings/polynomial/polynomial_number_field.pyx
in sage.rings.poly
nomial.polynomial_number_field.Polynomial_absolute_number_field_dense.gcd
(build/cythonized/sag
e/rings/polynomial/polynomial_number_field.c:1761)()
203 h1 = self._pari_with_name('x')
204 h2 = other._pari_with_name('x')
--> 205 g = h1.gcd(h2)
}}}
and at the bottom, pari/gen.pyx
--
Ticket URL: <http://trac.sagemath.org/ticket/18589#comment:52>
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