[R] Writing custom functions for rpart
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed May 9 16:01:16 CEST 2007
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.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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