On Fri, 20 Nov 2009 10:43:19 +0100 smu <m...@z107.de> wrote: > x <- c(3,5,7,3,9,7) > > as.numeric(as.factor(x)) > [1] 1 2 3 1 4 3
While that is my preferred solution too, this may be easier to understand: match(x,sort(unique(x))) (It is basically what 'factor' does.) The question wasn't quite clear, though. Should the first occuring number get the category 1, or should the *lowest* number get this category. I.e., what should be the result of x <- c(5,3,7,3,9,7) Should it be 1, 2, 3, 2, 4, 3 or 2, 1, 3, 1, 4, 3? The factor and match methods above give the second solution. To get the first solution, just remove the 'sort': match(x,unique(x)) -- Karl Ove Hufthammer ______________________________________________ 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.
