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https://issues.apache.org/jira/browse/MATH-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart updated MATH-704:
---------------------------------
Attachment: MATH-704.patch
I have found a small bug wrt this bug report. The sum of the weights is
calculated on the whole weight array rather than the specified sub-array
[begin, begin + length)
> 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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