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From "Konstantin Berlin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-901) FastMath.sin is slow
Date Tue, 20 Nov 2012 19:28:58 GMT

    [ https://issues.apache.org/jira/browse/MATH-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501394#comment-13501394
] 

Konstantin Berlin commented on MATH-901:
----------------------------------------

I have an program where I do an all-to-all summation of the sinc function of thousands of
objects. Though an FMM or GPU code would work better, but might be difficult for users to
implement.

It's called the Debye formula for small angle scattering (SAXS, SANS).
                
> 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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