 
  Have a look at the function arguments.  I think the function may not split a set of fewer than 20 objects, which is a default setting that can be changed.  In addition to rpart, you might want to look at tree.  
   
  regards,
  Farrar

Wensui Liu <liuwensui@gmail.com> wrote:
  with seeing more code and output, i guess your tree fails to grow.

On 2/28/07, Claudia Romero wrote:
> Hello,
> This is my first time addressing such a big audience so apologies in
> advance in case I fail to formulate this question.
>
> I am working with 13 species of trees, and the data I have are:
> 1 continuous (phenolic concentration in xylem and in phloem) and 2
> categorical variables: lineage (3 subclades) and habitat (fire and non
> fire).
>
> I am trying to see how species can be splitted 'objectively' based on
> these variables. I tried to do a regression tree using the rpart
> library, but repeatedly got the following answer, even when I tried to
> run it using ONLY the categorical variables:
>
> > plot(fit, compress=TRUE)
> Error in plot.rpart(fit, compress = TRUE) :
> fit is not a tree, just a root
>
> Can anyone please help me think about this?
>
> Many thanks,
> claudia romero
>
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-- 
WenSui Liu
A lousy statistician who happens to know a little programming
(http://spaces.msn.com/statcompute/blog)

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