#9322: long time in simon_two_descent for elliptic curves
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Reporter: cremona | Owner: AlexGhitza
Type: defect | Status: needs_info
Priority: major | Milestone: sage-6.2
Component: elliptic curves | Resolution:
Keywords: simon_two_descent ecc2011 | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #11005, #15483 | Stopgaps:
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Changes (by pbruin):
* dependencies: => #11005, #15483
Comment:
After applying #11005 (upgrade Simon's script to the latest version),
rather than running for a long time, this example now gives an error
similar to #15483:
{{{
sage: K.<w> = NumberField(x^2-x-232)
sage: E = EllipticCurve([2-w,18+3*w,209+9*w,2581+175*w,852-55*w])
sage: E.local_data()
[]
sage: E.simon_two_descent()
Traceback (most recent call last):
...
RuntimeError:
*** at top-level: ans=bnfellrank(K,[-a+2,3
*** ^--------------------
*** in function bnfellrank: ...eqtheta,rnfeq,bbnf];rang=
*** bnfell2descent_gen(b
*** ^--------------------
*** in function bnfell2descent_gen: ...und,r=nfsqrt(nf,norm(zc))
*** [1];if(DEBUGLEVEL_el
*** ^--------------------
*** array index (1) out of allowed range [none].
An error occurred while running Simon's 2-descent program
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/9322#comment:15>
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