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.
