Sorry for replying to my own post, but I found a solution. Still, a more elegant solution would be preferred.
On Thu, Jun 4, 2009 at 12:02 PM, Rainer M Krug <r.m.k...@gmail.com> wrote: > Hi > > I want to use order() to get the order of a vector. > > But I would need a different behavior when ties occur: similar to the > parameter ties.method = "random" in the rank() function, I would need > to randomise the ties. Is this possible? The solution is to randomize the vector before submitting to order(): x <- rep(1:10, 2) iS <- sample( length(x) ) o <- order( x[iS], na.last=NA, decreasing=TRUE) o [1] 8 16 12 17 2 9 7 15 10 11 4 14 3 5 13 20 1 6 18 19 x[iS][o] [1] 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 iS <- sample( length(x) ) o <- order( x[iS], na.last=NA, decreasing=TRUE) o [1] 14 19 13 20 2 18 3 10 1 15 4 9 11 12 6 7 8 16 5 17 > x[iS][o] [1] 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 Thanks Rainer > Example: > > x <- rep(1:10, 2) > order(x) > [1] 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 > order(x) > [1] 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 > > ## I would need different "order" for the ties, as below in rank() example: > > rank(x, ties.method="random") > [1] 1 4 6 7 10 12 13 15 18 19 2 3 5 8 9 11 14 16 17 20 >> rank(x, ties.method="random") > [1] 2 4 5 7 9 12 14 15 18 19 1 3 6 8 10 11 13 16 17 20 > > > Thanks > > Rainer > > -- > Rainer M. Krug, Centre of Excellence for Invasion Biology, > Stellenbosch University, South Africa > -- Rainer M. Krug, Centre of Excellence for Invasion Biology, Stellenbosch University, South Africa ______________________________________________ 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.
