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