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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1113) "FastMath.atan" is slow
Date Tue, 25 Mar 2014 16:20:18 GMT

    [ https://issues.apache.org/jira/browse/MATH-1113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13946739#comment-13946739
] 

Sebb commented on MATH-1113:
----------------------------

bq. both "FastMath.atan2" and "Math.atan" call the internal method ...

I assume that should read as follows?

bq. both "FastMath.atan2" and "FastMath.atan" call the internal method

In which case if Math.atan is significantly faster than Math.atan2 this could provide a simple
explanation for the relative slowness of FastMath.atan.

> "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: 3.3
>
>
> 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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