The proposal for the nabla sandbox component has been put in the svn
repository. You can view it online at the following URL:
http://svn.apache.org/viewvc/commons/sandbox/nabla/trunk/PROPOSAL.html?view=co
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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