#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):
John, if you change {{{eps}}} to {{{2^(-prec2+1)}}} instead of
{{{2^(-prec2)}}} then the case
where {{{r = 1 - 2^(-prec2)}}} will also terminate with the < condition.
But the case where
{{{r = 1 + 2^(-prec2+1)}}} will still loop.
If the target precision is {{{prec}}} and you compute internally with
{{{2*prec}}} bits, then
{{{eps}}} could be {{{2^(-prec)}}}, no?
Paul
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11767#comment:9>
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