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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-1113) "FastMath.atan" is slow
Date Wed, 12 Apr 2017 10:16:41 GMT

     [ https://issues.apache.org/jira/browse/MATH-1113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gilles updated MATH-1113:
-------------------------
    Fix Version/s:     (was: 4.X)
                   4.0

I set the "fix version" to 4.0 because this issue points to a rationale for changing the name
of the {{FastMath}} class.


> "FastMath.atan" is slow
> -----------------------
>
>                 Key: MATH-1113
>                 URL: https://issues.apache.org/jira/browse/MATH-1113
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.2
>            Reporter: Gilles
>            Priority: Minor
>              Labels: perfomance
>             Fix For: 4.0
>
>
> This issue is related to
>   MATH-740
>   MATH-901
> Micro-benchmarks show that "FastMath.atan2" is faster than "Math.atan2" but that "FastMath.atan"
is slower than "Math.atan". However, both "FastMath.atan2" and "Math.atan" call the internal
method "FastMath.atan(double,double,boolean)".
> It seems that some performance improvement could be achieved, through understanding why
the results seem contradictory.



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