[R] tree error
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jun 7 17:15:02 CEST 2000
> Date: Wed, 7 Jun 2000 10:45:43 -0400 (EDT)
> From: Robert Schilling Schick <rss6 at duke.edu>
> To: r-help at stat.math.ethz.ch
> Subject: [R] tree error
> Hi- I'm trying to run a classification tree, and have received an error
> I'm unfamiliar with. Following is the R code, and the first 10 lines of
> my matrix. Any help would be appreciated.
> > kuv.tree <- read.table("kuv3_mantelmatrix.txt",header=T,sep="\t")
> > library(tree)
> > attach(kuv.tree)
> > ktree <- tree(Species ~ Drig + dwellln, data=kuv.tree)
> Error in arg == choices : comparison (1) is possible only for vector types
What does traceback() give you? That message is coming from match.arg.
By the way, if you want a classification tree, you had better have
Species as a factor, and it looks as if you have not. See the help page!
Version of R?
Version of tree?
Are they the current ones?
Does example(tree) work for you?
If you can send me a reproducible example, I may be able to help.
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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