[R] min() return factor class values

From: Milton Cezar Ribeiro <milton_ruser_at_yahoo.com.br>
Date: Tue 09 Jan 2007 - 14:23:02 GMT

Hi R-friends    

  I donīt 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.    

  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,    


  > 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)
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"

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