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