#11767: elliptic_logarithm of high precision points often hangs forever
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Reporter: was | Owner: cremona
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.2
Component: elliptic curves | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by zimmerma):
ok, after looking again, it seems that using {{{prec2 = 2*prec}}} is
overkill.
Usually, what we do in MPFR is that we use as internal precision prec +
log2(prec) + a few bits.
To avoid computing a log(), I suggest using {{{prec2 = prec + 40}}} which
should be large enough.
With this change, William's example with prec=600 runs ok. John, if you
agree with that, I can
make a new patch.
Paul
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11767#comment:11>
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