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https://issues.apache.org/jira/browse/MATH-1396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved MATH-1396.
--------------------------
Resolution: Fixed
commit af1b5872ab8355acea3197522ddf94972b3c8386
> Overflows in "UniformIntegerDistribution"
> -----------------------------------------
>
> Key: MATH-1396
> URL: https://issues.apache.org/jira/browse/MATH-1396
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6.1
> Reporter: Gilles
> Assignee: Gilles
> Fix For: 4.0
>
>
> In {{o.a.c.m.distribution.UniformIntegerDistribution}}, several methods will
> compute an invalid result when the {{lower}} and {{upper}} bounds are such
> that
> {noformat}
> upper - lower
> {noformat}
> overflows.
> Affected methods:
> * {{probability}}
> * {{cumulativeProbability}}
> * {{getNumericalVariance}}
> Method
> * {{getNumericalMean}}
> will return an invalid result when
> {noformat}
> upper + lower
> {noformat}
> overflows.
> A possible fix is to define instances variables
> {noformat}
> upperPlusLower = (double) upper + (double) lower;
> upperMinusLower = (double) upper - (double) lower;
> {noformat}
> and use them instead of the respective integer operations in the above
> methods.
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