You can use match.fun x V1 V2 1 2 3.2 2 15 1.2 3 2 8.4 4 8 9.2 5 7 0.4
min <- aggregate(x, list(x[,1]), min) min <- aggregate(x, list(x[,1]), match.fun(min)) On 21/02/2008, Mcmahon, Kevin <[EMAIL PROTECTED]> wrote: > Hello list, > > > > I'm new to this list, so please forgive my ignorance. I have searched > R-help for some hints into what might be my problem, but I truly have no > idea where to go from here. > > > > I have an object of approximately 15,000 rows and 2 columns. There are > many duplicates in the first column, all with different corresponding > values in the second column. For example (2 is duplicated): > > 2 3.2 > > 15 1.2 > > 2 8.4 > > 8 9.2 > > 7 0.4 > > > > I used the following code to aggregate these based on the first column > and get the min and max: > > min<-aggregate(as.numeric(humanneph[,2]), > list(as.numeric(humanneph[,1])), min) > > max<-aggregate(as.numeric(humanneph[,2]), > list(as.numeric(humanneph[,1])), max) > > > > Both worked beautifully! > > > > THEN, I accidentally overwrote the object min. Since I hadn't touched > the object humanneph, I copied the above code from my saved history and > re-ran it. I get the following error: > > Error in FUN(X[[1L]], ...) : argument "INDEX" is missing, with no > default > > > > So, I went back and again, copying directly from my saved history, > re-made my object humanneph, and re-ran the above code again. Still the > same problem!!! > > > > So, it seems that after running this code once, suddenly aggregate does > not work!!! > > > > Can anyone help me? > > > > My sessionInfo() > > R version 2.5.1 (2007-06-27) > > i386-pc-mingw32 > > > > attached base packages: > > [1] "stats" "graphics" "grDevices" "utils" "datasets" > "methods" > > [7] "base" > > > > Thanks! > > Wyatt > > > > K. Wyatt McMahon, Ph.D. > > Postdoctoral Research Associate > > Department of Internal Medicine > > Texas Tech University Health Sciences Center > > Lubbock, TX > > 79430 > > (806)743-4072 > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ R-help@r-project.org 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.
