R help - Jul 2007 - Renamig a factor

Which is the proper way to rename a factor?
If I do:
test$Parc[test$Parc=="Ol?rdola"]<-"Ol?rdola"
R complains that
Warning message:
invalid factor level, NAs generated in: `[<-.factor`(`*tmp*`, test$Parc 
== "Ol?rdola", value = "Ol?rdola")

Thanks
Agus
-- 
Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: Agustin.Lobo at ija.csic.es
http://www.ija.csic.es/gt/obster

Try:

levels(test$Parc)[levels(test$Parc)=="OlÞrdola"] <-
"Olèrdola"

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

On 24/07/07, Agustin Lobo <Agustin.Lobo@ija.csic.es>
wrote:
>
> Which is the proper way to rename a factor?
> If I do:
> test$Parc[test$Parc=="OlÞrdola"]<-"Olèrdola"
> R complains that
> Warning message:
> invalid factor level, NAs generated in: `[<-.factor`(`*tmp*`, test$Parc
> == "OlÞrdola", value = "Olèrdola")
>
> Thanks
> Agus
> --
> Dr. Agustin Lobo
> Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
> LLuis Sole Sabaris s/n
> 08028 Barcelona
> Spain
> Tel. 34 934095410
> Fax. 34 934110012
> email: Agustin.Lobo@ija.csic.es
> http://www.ija.csic.es/gt/obster
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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