Re: [R] Writing custom functions for rpart

From: hadley wickham <h.wickham_at_gmail.com>
Date: Wed, 09 May 2007 16:38:09 +0200

On 5/9/07, Prof Brian Ripley <ripley_at_stats.ox.ac.uk> wrote:
> On Wed, 9 May 2007, hadley wickham wrote:
>
> > Hi everyone,
> >
> > Does anyone has experience with (or documentation for) writing custom
> > methods with rpart? The documentation hints: "Alternatively, 'method'
> > can be a list of functions 'init', 'split' and 'eval'", but doesn't
> > provide any details as to what those methods should do or what
> > arguments they should take etc.
> >
> > I've tried looking at the package source (and the source for the S
> > code it came from) but I can't follow what's going on in C vs R, and
> > as the default methods are coded in a different way, there are no
> > examples to follow.
>
> But there are, in the tests directory.

Thanks, I had missed those. Perhaps a pointer from the documentation would be appropriate?

Hadley



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