[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!

Usual questions:

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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