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https://issues.apache.org/jira/browse/MATH-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Steitz reopened MATH-1203:
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Thanks for reviewing, Thomas. I did think about checking variance = 0 instead
and probably should have done that. In fact, since it is possible that a
non-constant user-supplied kernel can have no support in a bin, the 0/0
computation that led to this bug could happen even without variance == 0. So I
guess a more robust test is first check if the distribution is variance is 0,
then check kB > 0. Thanks again for reviewing.
> getKernel fails for buckets with only multiple instances of the same value in
> random.EmpiricalDistribution
> ----------------------------------------------------------------------------------------------------------
>
> Key: MATH-1203
> URL: https://issues.apache.org/jira/browse/MATH-1203
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.4, 3.4.1
> Reporter: Kyle Kavanagh
>
> After loading a set of values into an EmpericalDistribution, assume that
> there's a case where a single bin ONLY contains multiple instances of the
> same value. In this case the standard deviation will equal zero. This will
> fail when getKernel attempts to create a NormalDistribution. The other case
> where stddev=0 is when there is only a single value in the bin, and this is
> handled by returning a ConstantRealDistribution rather than a
> NormalDistrbution.
> See: https://issues.apache.org/jira/browse/MATH-984
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