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Posted to issues@commons.apache.org by "Anders Conbere (JIRA)" <ji...@apache.org> on 2014/08/11 20:34:12 UTC

[jira] [Created] (MATH-1145) Integer overflows MannWhitneyUTest#mannWhitneyU

Anders Conbere created MATH-1145:
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             Summary: Integer overflows MannWhitneyUTest#mannWhitneyU
                 Key: MATH-1145
                 URL: https://issues.apache.org/jira/browse/MATH-1145
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.3, 3.4
            Reporter: Anders Conbere


In the calculation of MannWhitneyUTest#mannWhitneyU there are two instances where the lengths of the input arrays are multiplied together. Because Array#length is an integer this means that the effective maximum size of your dataset until reaching overflow is Math.sqrt(Integer.MAX_VALUE).

The following is a link to a diff, with a test the exposes the issue, and a fix (casting lengths up into doubles before multiplying).

https://gist.github.com/aconbere/4fef56e5182e510aceb3



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