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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-901) FastMath.sin is slow
Date Sat, 17 Nov 2012 23:28:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499557#comment-13499557
] 

Gilles commented on MATH-901:
-----------------------------

Can you estimate how much work it would be to port the improvement to "FastMath".

I haven't read the paper, but it seems that the result is "less accurate". Given that the
accuracy requirement for "FastMath" is quite stringent, could this code really be used? Or
would we have to create "FastAccurateMath" and "VeryFastButNotSoAccurateMath"?

                
> FastMath.sin is slow
> --------------------
>
>                 Key: MATH-901
>                 URL: https://issues.apache.org/jira/browse/MATH-901
>             Project: Commons Math
>          Issue Type: Sub-task
>    Affects Versions: 3.0
>         Environment: Mac OS 10.8.2, Java 7
>            Reporter: Konstantin Berlin
>         Attachments: SineTest.java
>
>
> The FastMath.sin (maybe other functions too) are not nearly as fast as some other libraries
that can be found on the internet.
> The *much* faster code can be found here http://www.oliford.co.uk/phys/code/AlgorithmRepository/src/jafama/.
> Max Absolute Error Apache vs JDK: 1.1102230246251565E-16
> Max Absolute Error Alternative vs JDK: 5.551115123125783E-16
> JDK Time: 0.698
> Apache Time: 0.491
> Alternative Time: 0.18
> I will add my test code as soon as I figure out how.

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