[R] dimnames in pkg "ipred"

["Häring, Tim (LWF)"]

I think I solved the problem =)
My dataset is an .arff file. So I read my data into R via read.arff.
I tried the following:
Export the dataframe to an txt-file and import it once again in R via read.table.
With the new dataset if works fine. Maybe the error comes from the variable-names. I attached a txt-file containing the str(traindat.bin) output from the data.frame, which I import via read.arff

Cheers,
TIM


-----Ursprüngliche Nachricht-----
Von: Uwe Ligges [mailto:ligges at statistik.tu-dortmund.de] 
Gesendet: Friday, January 23, 2009 11:03 AM
An: Häring, Tim (LWF)
Betreff: Re: AW: [R] dimnames in pkg "ipred"



Häring, Tim (LWF) wrote:
> 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.

What does str(traindat.bin) tell you? Is it a data.frame?
Can you reduce the data.frame in a way (less variables and observations) 
so that you can send the rest by e-mail and we can see the error?

Uwe Ligges


> Cheers,
> TIM
> 
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: Uwe Ligges [mailto:ligges at statistik.tu-dortmund.de] 
> Gesendet: Thursday, January 22, 2009 6:49 PM
> An: Häring, Tim (LWF)
> Cc: r-help at 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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>>
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