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From "Ole Ersoy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-540) AbstractIntegerDistribution.inverseCumulativeProbability(...) Bug
Date Mon, 07 Mar 2011 16:11:59 GMT

    [ https://issues.apache.org/jira/browse/MATH-540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003414#comment-13003414
] 

Ole Ersoy commented on MATH-540:
--------------------------------

OK - I think it's starting to make more sense to me now.  So when implementing sampling we
just add one to the value returned by inverseCumulativeDistribution, unless the uniform probability
argument is 1?

> AbstractIntegerDistribution.inverseCumulativeProbability(...) Bug
> -----------------------------------------------------------------
>
>                 Key: MATH-540
>                 URL: https://issues.apache.org/jira/browse/MATH-540
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Ole Ersoy
>             Fix For: 3.0
>
>         Attachments: DummyDiscreteDistribution.java, DummyDiscreteDistributionTest.java
>
>
> The AbstractIntegerDistribution.inverseCumulativeProbability(...) function attempts to
decrement the lower bound of discrete distributions to values that go below the lower bound.

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