#17675: xgcd(2,2) hangs forever in ZZ['x']
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Reporter: vdelecroix | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.5
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Reported upstream. No | Work issues:
feedback yet. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Old description:
> On sage-6.5.beta6 we have
> {{{
> sage: R.<x> = ZZ['x']
> sage: R(2).xgcd(R(2)) # be prepared to wait
> }}}
> It is possibly a problem with our FLINT interface with the function
> `fmpz_poly_xgcd`.
New description:
On sage-6.5.beta6 we have
{{{
sage: R.<x> = ZZ['x']
sage: R(2).xgcd(R(2)) # be prepared to wait
}}}
Seems to be a problem in FLINT (the function `fmpz_poly_xgcd`). See this
[https://github.com/wbhart/flint2/issues/112 bug report].
As soon as the issue is fixed on the FLINT side, we should add the above
test somewhere in Sage (probably in the xgcd function of integer
polynomials).
--
Comment (by vdelecroix):
Replying to [comment:2 rws]:
> Reported at https://github.com/wbhart/flint2/issues/112
Thanks Ralf! I was not enough familiar to FLINT (and it was late after the
bug tracking) to write the sample program.
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/17675#comment:3>
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