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From "Sergii Nechuiviter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-1234) Impossible NotStrictlyPositiveException after getStandardDeviation()
Date Wed, 17 Jun 2015 13:33:00 GMT
Sergii Nechuiviter created MATH-1234:
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             Summary: Impossible NotStrictlyPositiveException after getStandardDeviation()
                 Key: MATH-1234
                 URL: https://issues.apache.org/jira/browse/MATH-1234
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.2
         Environment: Windows 7, Java 1.8
            Reporter: Sergii Nechuiviter


org.apache.commons.math3.random.EmpiricalDistribution.density() calls 
EmpiricalDistribution.getKernel which calls
bStats.getStandardDeviation() -- bStats is SummaryStatistics
and return result caused NotStrictlyPositiveException: standard deviation (0)
in new NormalDistribution(randomData.getRandomGenerator(),
                bStats.getMean(), bStats.getStandardDeviation(),
                NormalDistribution.DEFAULT_INVERSE_ABSOLUTE_ACCURACY);

As I understand, it shouldn't be so by contract of SummaryStatistics.



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