Milton, have you looked at the structure of your data.frame?
str(especies.aicc) Are you sure especies.aicc is defined as numeric? b On Jan 9, 2007, at 10:51 AM, Milton Cezar Ribeiro wrote: > Dear Peter, > > I tryed something like > >> head(especies.aicc) > especie aicc > 1 Attila.rufus 17.15934 > 2 Attila.rufus 11.41371 > 3 Attila.rufus 11.41371 > 4 Attila.rufus 19.55998 > 5 Attila.rufus 17.23780 > 6 Attila.rufus 19.22545 > >> especies.min<-aggregate.data.frame(especies.aicc,list > (Especie=especies.aicc$especie),max) > > But it works fine only for "mean" FUN and not for "min" and > "max". Also also, when I use "mean" I got the following warnings: > >> especies.min<-aggregate.data.frame(especies.aicc,list > (Especie=especies.aicc$especie),mean) > > Warning messages: > 1: argument is not numeric or logical: returning NA in: mean.default > (X[[1]], ...) > 2: argument is not numeric or logical: returning NA in: mean.default > (X[[2]], ...) > > In fact I need only min() and max(). > > Miltinho > ----------------- > > Peter Dalgaard <[EMAIL PROTECTED]> escreveu: > 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 > > > > > __________________________________________________ > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.