Milton Cezar Ribeiro wrote: > Hi R-friends > > I don´t know why the "min()" function below return the min value as factor. > When i force the aicc.min using a as.numeric() function, it return a factor > index (1,2,..) and not min value as I want. By the way, I included a > sessionInfo() at the end of this e-mail. > min() is not doing anything out of the ordinary, but cbind'ing it with the character vector sp coerces it to character and rbind'ing to a data frame turns character vectors into factors...
The whole thing looks like it could be a straightforward application of aggregate(). > > In fact I had the same problem (values as factor) on other part of my > script and I noticed that it occour when I use "cbind()". It is real? > > Any idea? > > Kind regards, > > Miltinho > > > especies.aicc.min<-data.frame() > >> for (sp in levels(especies.aicc$especie)) >> > + { > + sele<-subset(especies.aicc,especie==sp) > + > especies.aicc.min<-rbind(especies.aicc.min,cbind(sp,aicc.min=min(sele$aicc))) > + } > >> especies.aicc.min >> > sp aicc.min > 1 Attila.rufus 6.7387056413613 > 2 Automolus.leucophthalmus 125.791300522824 > >> class(especies.aicc.min$aicc.min) >> > [1] "factor" > > ----------- > > sessionInfo() > R version 2.4.0 (2006-10-03) > i386-pc-mingw32 > locale: > LC_COLLATE=English_Jamaica.1252;LC_CTYPE=English_Jamaica.1252;LC_MONETARY=English_Jamaica.1252;LC_NUMERIC=C;LC_TIME=English_Jamaica.1252 > attached base packages: > [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" > "base" > > > -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.