On 24-03-2012, at 16:08, Alaios wrote: > Dear all, > I am using expand.grid for calculating all the possible values between four > pairs. > > I would like to ask you if it is possible to filter the result out, so to > keep all unique pairs. In my algorithm the input c(1,2) produces the same > results as the c(2,1) > > so for example in the following code below > >> expand.grid(c(1,2,3),c(1,2,3)) > Var1 Var2 > 1 1 1 > 2 2 1 > 3 3 1 > 4 1 2 > 5 2 2 > 6 3 2 > 7 1 3 > 8 2 3 > 9 3 3 > > > 2,1 duplicates with 1,2 > 3,1 duplicates with 1,3 > > How I can removed these entries? The expand.grid function does not seem to > have more arguments.
http://r.789695.n4.nabble.com/unique-combinations-td4220850.html http://stackoverflow.com/questions/9028369/removing-duplicate-combinations-in-r-irrespective-of-order Berend ______________________________________________ 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.
