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From "Niall Pemberton" <>
Subject Re: [PROPOSAL][nabla] proposal and start code are available in subversion repository
Date Tue, 15 Apr 2008 16:25:39 GMT
I've uploaded the Nabla site - but I used the 5-SNAPSHOT version of
commons-sandbox-parent to avoid the issue Matt found with the apidocs.
Should be there in a few hours after the next sync.


On Tue, Apr 15, 2008 at 2:42 PM, Luc Maisonobe <> wrote:
> The proposal for the nabla sandbox component has been put in the svn
> repository. You can view it online at the following URL:
>  The existing code has been imported too (sorry for the commit noise). You
> can check it out and look at it. It has been developped using Java 1.5, but
> there is no real need for this version. If you prefer to have 1.4 compatible
> code, I will remove the parametric collections I used. For a new packages, I
> thought 1.5 would be a good start but I would like to hear your comments.
>  All tests do pass, the tests are a good way to understand what the package
> does. In many test cases, there are small classes implementing the
> ReferenceFunction interface (used only for tests). This interfaces defines
> both the f function that will be differentiated and the fPrime function that
> is the derivative of the previous one. Of course, the implementation of this
> function is for reference purposes: the differentiation process uses only
> the f function and generate the derivative, then the test harness compare
> this generated function with the exact one implemented by fPrime. You will
> see that in many cases, the error is exactly 0 and in some cases I had to
> use a comparison threshold between 1.0e-13 and 1.0e-16.
>  I am ready to hear any comments or complaints. If some of you want to
> contribute, just add your name to the proposal in the inital contributors
> section and let me know. Building a community around this project is one of
> my main goal now.
>  Luc
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