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From "Phil Steitz (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-704) One of Variance.evaluate() methods does not work correctly
Date Wed, 30 Nov 2011 06:27:39 GMT

     [ https://issues.apache.org/jira/browse/MATH-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz resolved MATH-704.
------------------------------

    Resolution: Fixed

Good catch, Thomas.  Thanks!  Patch, with test case added, committed in r1208291.
                
> One of Variance.evaluate() methods does not work correctly
> ----------------------------------------------------------
>
>                 Key: MATH-704
>                 URL: https://issues.apache.org/jira/browse/MATH-704
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2
>         Environment: Java 1.6
>            Reporter: Leonid Ilyevsky
>            Assignee: Phil Steitz
>             Fix For: 3.0
>
>         Attachments: MATH-704.patch
>
>
> The method org.apache.commons.math.stat.descriptive.moment.Variance.evaluate(double[]
values, double[] weights, double mean, int begin, int length) does not work properly. Looks
loke it ignores the length parameter and grabs the whole dataset.
> Similar method in Mean class seems to work.
> I did not check other methods taking the part of the array; they may have the same problem.
> Workaround: I had to shrink my arrays and use the method without the length.

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