#16968: Random failure in gaussian sampler
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: statistics | Resolution:
Keywords: random_fail | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> Reported on sage-devel with sage-6.4.beta3:
> {{{
> sage -t --long src/sage/stats/distributions/discrete_gaussian_integer.pyx
> **********************************************************************
> File "src/sage/stats/distributions/discrete_gaussian_integer.pyx",
> line 262, in
> sage.stats.distributions.discrete_gaussian_integer.DiscreteGaussianDistributionIntegerSampler.__init__
> Failed example:
> min(l), max(l), abs(mean(l)-2.5) < 0.01
> Expected:
> (-2, 7, True)
> Got:
> (-2, 6, True)
> }}}
> This happened also at http://trac.sagemath.org/ticket/15915#comment:54
New description:
Reported on sage-devel with sage-6.4.beta3:
{{{
sage -t --long src/sage/stats/distributions/discrete_gaussian_integer.pyx
**********************************************************************
File "src/sage/stats/distributions/discrete_gaussian_integer.pyx",
line 262, in
sage.stats.distributions.discrete_gaussian_integer.DiscreteGaussianDistributionIntegerSampler.__init__
Failed example:
min(l), max(l), abs(mean(l)-2.5) < 0.01
Expected:
(-2, 7, True)
Got:
(-2, 6, True)
}}}
Specifically it happened once in `make ptestlong`. After that, 10/10 of
`sage -t --long
src/sage/stats/distributions/discrete_gaussian_integer.pyx` passed and
10/10 of manual input into Sage passed. The machine was an AMD Phenom X6
1055T with 8GB RAM running up-to-date OpenSuSE 12.3 (Linux
3.7.10-1.40-desktop).
This happened also at http://trac.sagemath.org/ticket/15915#comment:54
--
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Ticket URL: <http://trac.sagemath.org/ticket/16968#comment:2>
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