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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-935) DerivativeStructure.atan2(y,x) does not handle special cases properly
Date Fri, 15 Feb 2013 08:07:12 GMT
Luc Maisonobe created MATH-935:
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             Summary: DerivativeStructure.atan2(y,x) does not handle special cases properly
                 Key: MATH-935
                 URL: https://issues.apache.org/jira/browse/MATH-935
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.1.1
            Reporter: Luc Maisonobe
            Priority: Minor


The four special cases +/-0 for both x and y should give the same values as Math.atan2 and
FastMath.atan2. However, they give NaN for the value in all cases.

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