[R] Rpart

[mxkuhn]

This mostly happens when the data contain invalid column names (such as all numbers). Try using make.names() on the datasets. 

Max

On Oct 30, 2011, at 11:35 AM, Luisa Sêco <luisa.seco at gmail.com> wrote:

> Dear users,
> 
> I'm using rpart for classification trees, but my code isn't working when I
> try to use all the variables in my data frame. This data frame was created
> from a data frame with 1775 variables, but I choose only 13.
> 
> arv13<-rpart(iv~.,data=gn,method="class",parms=list(split="information"))
> 
> #Error:
> 
> Error in `[.data.frame`(frame, predictors) : undefined columns selected
> 
> "gn" is a data.frame, so I don't understand where is my mistake.
> 
> If I read the data.frame from a txt file "g13.txt" previously saved,
> instead creating the data.frame "gn" from the data frame with 1775
> variables (columns), it works.
> 
> My question is: which properties must the data file have to use rpart doing
> "iv ~ ." ?
> 
> Thank you very much,
> 
> My best regards
> 
> Luísa Sêco
> <g13.txt>
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