R help - Oct 2011 - Rpart

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

Lu?sa S?co
-------------- next part --------------
"iv" "754" "923" "972" "1058"
"1223" "2118" "2593" "2605"
"2777" "3055" "3186" "3193"
"3393"
"1" 3 1 0 1 1 1 1 0 0 0 1 0 0 0
"2" 2 1 1 1 1 0 0 1 0 0 0 1 1 1
"3" 2 1 0 1 1 0 0 1 1 0 0 1 0 1
"4" 3 1 1 1 1 0 0 0 0 0 1 1 0 0
"5" 2 1 1 1 1 0 0 1 0 0 1 1 0 0
"6" 2 1 1 1 1 0 0 1 0 0 0 0 1 1
"7" 1 1 0 1 1 0 1 0 1 0 0 0 1 1
"8" 3 1 1 1 1 0 1 0 0 0 0 1 1 1
"9" 2 1 0 1 1 0 0 0 0 0 1 0 0 1
"10" 2 1 1 0 1 0 0 1 0 0 1 0 1 0
"11" 2 1 0 1 1 0 0 0 0 0 1 0 0 1
"12" 1 1 1 1 1 1 1 0 1 0 1 0 0 0
"13" 1 1 0 1 1 1 0 1 1 1 0 0 1 0
"14" 1 1 1 1 1 1 1 0 1 0 0 0 1 0
"15" 2 1 0 1 1 1 0 1 0 0 1 1 1 0
"16" 1 1 0 1 0 0 0 1 0 1 1 0 1 0
"17" 1 0 1 1 1 1 1 0 1 1 0 0 1 0
"18" 2 1 1 1 1 0 0 0 0 0 1 0 0 0
"19" 1 0 0 1 1 0 1 1 1 0 1 0 1 0
"20" 3 1 0 1 1 0 1 0 1 0 0 0 1 1
"21" 2 1 0 0 1 0 0 0 0 0 1 0 0 1
"22" 1 0 0 1 1 1 1 1 1 0 1 0 1 0
"23" 1 0 0 1 0 0 0 1 0 0 1 0 1 0
"24" 2 0 1 1 1 1 0 1 0 0 1 0 1 1
"25" 1 0 0 1 1 0 0 0 1 1 0 0 1 0
"26" 3 1 0 0 1 0 0 0 0 0 1 0 1 1
"27" 2 1 1 0 1 0 0 1 0 0 1 1 0 0
"28" 3 1 1 1 1 0 0 0 1 0 0 0 1 0
"29" 1 0 0 1 0 1 0 0 1 1 1 0 1 0
"30" 3 1 0 0 1 0 1 1 1 0 0 1 1 1
"31" 3 0 0 0 1 0 0 0 0 0 0 0 1 1
"32" 3 0 0 1 1 1 1 1 0 1 0 0 1 0
"33" 1 1 1 1 1 1 1 0 1 1 1 0 1 0
"34" 1 1 0 1 0 1 0 0 1 0 0 0 0 0
"35" 3 1 1 1 1 0 0 0 1 0 1 0 1 1
"36" 2 1 1 0 1 0 0 0 0 1 1 0 1 1
"37" 3 1 0 1 1 0 0 1 0 0 0 0 1 1
"38" 3 0 0 1 1 0 1 0 0 0 0 0 1 1
"39" 2 1 1 1 1 0 0 1 0 0 1 1 1 1
"40" 2 1 1 1 1 0 0 1 0 1 0 0 1 1
"41" 3 1 1 1 1 1 1 0 1 1 1 1 1 1
"42" 3 1 0 1 1 0 1 0 1 1 1 0 1 0
"43" 1 0 0 1 1 0 0 0 1 1 0 0 1 0
"44" 3 0 1 0 1 0 0 1 1 0 1 0 1 0
"45" 2 1 1 1 1 1 0 0 0 0 0 0 1 0
"46" 3 1 1 1 1 0 0 0 1 0 0 1 1 1
"47" 2 1 0 0 1 0 0 0 0 0 1 0 0 1
"48" 1 0 0 1 1 1 0 1 1 1 0 1 1 0
"49" 3 1 1 0 1 0 0 0 1 0 0 0 1 0
"50" 2 1 1 0 1 1 0 1 1 0 1 1 1 1
"51" 2 1 0 1 1 1 0 1 1 0 1 1 0 1
"52" 1 1 0 1 1 1 0 0 1 1 0 0 1 0
"53" 3 1 1 0 1 0 0 0 0 0 1 1 0 0
"54" 1 1 0 0 1 1 0 1 0 0 0 0 1 1
"55" 2 1 0 0 1 0 0 1 1 0 1 1 0 0
"56" 2 1 0 0 1 0 0 1 1 0 1 1 0 1
"57" 2 1 1 0 1 0 0 1 1 1 0 1 1 1
"58" 3 1 1 0 1 0 0 0 0 0 0 0 1 0
"59" 3 1 1 0 1 0 0 0 0 0 0 0 1 0
"60" 1 1 0 1 1 0 0 0 0 1 1 0 1 0
"61" 1 1 1 0 0 0 0 0 0 0 1 1 1 1
"62" 2 1 1 0 1 0 0 1 0 1 1 1 0 1
"63" 2 1 1 1 1 0 0 1 0 0 1 0 1 1
"64" 2 1 1 1 1 0 0 1 0 0 1 0 1 1
"65" 1 1 0 1 0 1 1 0 1 1 0 0 1 0
"66" 2 1 1 0 1 0 0 1 0 1 1 1 0 0
"67" 2 1 0 0 1 0 0 0 0 0 1 0 1 0
"68" 2 1 1 0 1 0 0 0 0 0 1 0 0 0
"69" 2 1 1 0 1 0 0 1 1 0 1 1 1 1
"70" 1 1 0 0 1 1 0 0 0 0 0 0 1 1
"71" 3 1 1 0 1 0 0 0 1 0 0 1 1 1
"72" 3 1 0 1 1 1 0 0 1 1 0 0 0 0

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 S?co <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
> 
> Lu?sa S?co
> <g13.txt>
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http://www.R-project.org/posting-guide.html
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