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From "Leonid Ilyevsky (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-704) One of Variance.evaluate() methods does not work correctly
Date Tue, 08 Nov 2011 23:09:51 GMT
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


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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