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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-935) DerivativeStructure.atan2(y,x) does not handle special cases properly
Date Fri, 15 Feb 2013 08:23:13 GMT

     [ https://issues.apache.org/jira/browse/MATH-935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-935.
--------------------------------

    Resolution: Fixed

Fixed in subversion repository as of r1446473.
                
> 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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