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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2013/02/15 09:07:12 UTC

[jira] [Created] (MATH-935) DerivativeStructure.atan2(y,x) does not handle special cases properly

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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