I can well imagine that having all those variable names with "=" in
them could create a problem.
> str(traindat.bin)
'data.frame': 5414 obs. of 98 variables:
$ SOIL_UNIT : Factor w/ 82
levels "17b","19a","19b",..: 1 1 1 1 1 1 1 1 1 1 ...
$ GEOL_UNIT=Allgaeuschichten : Factor w/ 2
levels "f","t": 1 1 1 1 1 1 1 1 1 1 ...
$ GEOL_UNIT=Anmooriger_Boden : Factor w/ 2
levels "f","t": 1 1 1 1 1 1 1 1 1 1 ...
Perhaps read.table does a more thorough job of checking variable names
than does read.arff?
--
David Winsemius
On Jan 23, 2009, at 5:23 AM, Häring, Tim (LWF) wrote:
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:lig...@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:lig...@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
-------------------------------------------------------------------------------
Dipl.-Geogr. Tim Häring
Sachgebiet Standort und Bodenschutz (SG 2.1)
Bayerische Landesanstalt für Wald und Forstwirtschaft
Am Hochanger 11
D-85354 Freising
Tel.: +49-(0)8161/71-4769
E-Mail: tim.haer...@lwf.bayern.de
http://www.lwf.bayern.de
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<str_traindat.bin.txt>______________________________________________
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