I'm having a similar problem, and after looking through the test directory I believe I have it down pat, but would someone mind telling me if I have it correctly, and if not, what I need to fix?
eval: this seems to be the evaluation of a node, used for for labeling it with whatever decision method is being used. split: this seems to be the split decision itself. I have a small problem here, because I don't understand exactly how this function will be called. I assume that, for each covariate in the problem this will be called ONCE, and then among all the returned "goodness" values, the largest is chosen and a decision is made. init: I don't understand the purpose of this function at all, and I was going to just try and copy the one from anovatest.s, but if someone can explain it to me it would be appreciated. I'm also wondering: overall, do my three functions need to accept the exact same variables that temp1, temp2 and temp3 do? It seems to me that they would have to for them to be called by another program, but if this is the case then I don't know what to do with wt or parms? Thanks, Sam Stewart On May 9, 2007 10:38 AM, hadley wickham <[EMAIL PROTECTED]> wrote: > On 5/9/07, Prof Brian Ripley <[EMAIL PROTECTED]> 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 > > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
