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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-901) FastMath.sin is slow
Date Tue, 20 Nov 2012 20:30:58 GMT

    [ https://issues.apache.org/jira/browse/MATH-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501444#comment-13501444
] 

Thomas Neidhart commented on MATH-901:
--------------------------------------

Hi Jeff,

thanks for your feedback, I will create bug reports for the issues you reported.

I am also +1 on having an AccurateMath and a FastMath implementation with the following characteristics:

 * AccurateMath: being more accurate, and faster *if* possible than Math (more or less the
current FastMath)
 * FastMath: being (considerably) faster with tradeoffs for accuracy (more or less the jodk
FastMath)

What would be an acceptable loss of accuracy, opinions?

If we decide to do something like this, we should also add a specific page in the user guide,
describing the differences with figures for performance and accuracy. Right now, FastMath
is advertised as safe drop-in replacement to Math, but with two diverting implementations
with different goals, users would need more guidance I guess.
                
> 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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