OK, the information I send to the list were rather sparse. Sorry for that!
I just tried the command with the recent Version of R and ipred. The error message is the same.
I want to create a classification model. My data consist of 5414 observations and 98 variables whereof 33 are numeric, the remainder are binary nominal (factor) variables. My output SOIL_UNIT is a factor variable with 82 levels.

I hope this are enough information to understand the problem.

Cheers,
TIM



-----Ursprüngliche Nachricht-----
Von: Uwe Ligges [mailto:ligges@statistik.tu-dortmund.de] 
Gesendet: Thursday, January 22, 2009 6:49 PM
An: Häring, Tim (LWF)
Cc: r-help@r-project.org
Betreff: Re: [R] dimnames in pkg "ipred"



Häring, Tim (LWF) wrote:
> Hello List,
> 
>  
> 
> I`m trying to make prediction using a bagged tree with the package ipred. I tried to follow the manual but I`m getting an error message. Also browsing through the list-archive I didn`t find any hint. 
> 
> Maybe someone can help me?
> 
>  
> 
> selbag <- bagging(SOIL_UNIT ~., data=traindat.bin, coob=TRUE)
> 
> Error in dimnames(X) <- list(dn[[1L]], unlist(collabs, use.names = FALSE)) : 
> 
>   length of 'dimnames' [2] not equal to array extent
> 
>  
> 
> I´m using R 2.7.2 on Win XP and the latest version of ipred.


Please do read the posting guide.

- We do not have "traindat.bin", hence cannot reproduce your problem
- Does it happen with recent versions of R and ipred?

Best,
Uwe Ligges




>  
> 
> Thanks a lot.
> 
> TIM
> 
>  
> 
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