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From Al Chou <hotfusion...@yahoo.com>
Subject RE: [math] Priority
Date Wed, 28 May 2003 20:36:59 GMT
--- Brent Worden <brent@worden.org> wrote:
> > and unit tests.  While things like rootfinding for
> > non-differentiable functions
> > may eventually have a place and may benefit from algorithms that
> > someone can
> > claim copyright ownership of, if no one else does it before I get
> > to it, I will
> > translate my simple newton's method implementation (which is trivial) and
> > submit it. I would appreciate input on what a nice Java interface
> > would look
> > like for rootfinding, initally assuming that the function has a
> > derivative, but
> > ideally extensible to support strategies that do not require
> > differentiability.
> 
> In the chi-square patch, I created a root finding utility class.  I used the
> bisection method to provide a default mechanism for computing inverse CDFs.
> It's driven by a simple Function interface.  Check it out and see if it's
> something you can use or improve.
> 
> The relevant types are org.apache.jakarta.commons.math.RootFinding and
> org.apache.jakarta.commons.math.Function and there it's utilized in
> org.apache.jakarta.commons.math.stat.distribution.AbstractContinuousDistribu
> tion.
> 
> Let me know what you think.
> 
> Brent Worden
> http://www.brent.worden.org


Brent,

I think I have a few improvements that came to mind while I was coding a
Ridders' method implementation.  Should I send you a diff file privately?


Al

=====
Albert Davidson Chou

    Get answers to Mac questions at http://www.Mac-Mgrs.org/ .

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