#13107: python long division causing infinite loop
------------------------------------------------+---------------------------
Reporter: titusn | Owner: burcin
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-5.3
Component: symbolics | Resolution:
Keywords: pynac division | Work issues:
Report Upstream: N/A | Reviewers: Burcin
Erocal, Jean-Pierre Flori
Authors: Titus Nicolae, Burcin Erocal | Merged in:
Dependencies: #13316 | Stopgaps:
------------------------------------------------+---------------------------
Changes (by jpflori):
* status: new => needs_review
* reviewer: Burcin Erocal => Burcin Erocal, Jean-Pierre Flori
* dependencies: => #13316
* work_issues: spkg for pynac 0.2.5 =>
Old description:
> {{{
>
> sage: ~SR(2L)
>
> local/bin/sage-sage: line 303: 9165 Segmentation fault sage-ipython
> "$@" -i
>
> }}}
> {{{~SR(2L)}}}is evaluated to {{{ SR(2L)^(-1) }}}[[BR]]
>
> because of a faulty simplification in the power::eval function it
> generates power objects recursively
New description:
{{{
sage: ~SR(2L)
local/bin/sage-sage: line 303: 9165 Segmentation fault sage-ipython
"$@" -i
}}}
{{{~SR(2L)}}}is evaluated to {{{ SR(2L)^(-1) }}}[[BR]]
because of a faulty simplification in the power::eval function it
generates power objects recursively.
A Pynac update fixing that is available in #13316.
Here are the corresponding doctests.
Apply:
* [attachment:power+review.patch]
--
Comment:
I've just slightly homogenized the patch.
I'll test it tomorrow and should then give positive review.
I've opened another ticket for the update to pynac 0.2.5;
maybe not the greatest idea, but at that time I thought that #13262 should
be affected by 0.2.5 as well.
Whatsoever, both this ticket and #13316 should be merged together.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13107#comment:4>
Sage <http://www.sagemath.org>
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