#9770: SphericalDistribution() is not random
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Reporter: schilly | Owner: amhou
Type: defect | Status: closed
Priority: major | Milestone: sage-5.0
Component: statistics | Resolution: fixed
Keywords: | Merged in: sage-5.0.beta9
Authors: Douglas | Reviewers: Jason Grout, Jeroen Demeyer
McNeil | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: #9958 |
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Description changed by chapoton:
Old description:
> In the following list {{{l}}}, some elements repeat quite often:
>
> {{{
> sage: l = [ SphericalDistribution(dimension=2).get_random_element() for _
> in range(1000)]
> sage: uniq = []
> sage: for x in l:
> if x not in uniq:
> uniq.append(x)
> ....:
> sage: len(uniq)
> 34
> }}}
>
> The output is not random. For example, the first line is repeated ~30
> times in the 1000 lines of output. It works fine if
> !SphericalDistribution is only instantiated once!
New description:
In the following list {{{l}}}, some elements repeat quite often:
{{{
sage: l = [ SphericalDistribution(dimension=2).get_random_element() for _
in range(1000)]
sage: uniq = []
sage: for x in l:
if x not in uniq:
uniq.append(x)
....:
sage: len(uniq)
34
}}}
The output is not random. For example, the first line is repeated ~30
times in the 1000 lines of output. It works fine if !SphericalDistribution
is only instantiated once!
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Ticket URL: <http://trac.sagemath.org/ticket/9770#comment:19>
Sage <http://www.sagemath.org>
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