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