[jira] [Resolved] (MATH-1136) BinomialDistribution deals with degenerate cases incorrectly

["Phil Steitz (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-1136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Phil Steitz resolved MATH-1136.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 3.4

Patch applied in r1609775.  Thanks for reporting this and thanks for the patch!

> BinomialDistribution deals with degenerate cases incorrectly
> ------------------------------------------------------------
>
>                 Key: MATH-1136
>                 URL: https://issues.apache.org/jira/browse/MATH-1136
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.3
>            Reporter: Aleksei Dievskii
>            Priority: Minor
>              Labels: bug, patch
>             Fix For: 3.4
>
>         Attachments: BINOMIAL_DEGENERATE.patch
>
>
> The following calculation returns false results:
> {{new BinomialDistribution(0, 0.01).logProbability(0)}}
> It evaluates to Double.NaN when it should be 0 (cf., for example, "dbinom(0, 0, 0.01, log=T)" in R).
> I attach a patch dealing with the problem. The patch also adds a test for this bug.



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