On 09-10-2013, at 13:50, Ronald Peterson <r...@hub.yellowbank.com> wrote:
> Hi, > > New to R here. Lots of fun. Still rather green though. > > I'd like to select unique items from a list that looks like this (for > example): > >> xyz > $x > [1] 8 6 9 0 0 3 9 7 1 9 > $y > [1] 1 2 9 5 1 2 0 9 2 9 > $z > [1] 5 6 9 0 5 1 1 7 3 4 > > I'd like to select unique (x,y), while preserving association with z > values. When there are duplicate (x,y) pairs, it doesn't really matter > which (x,y,z) triplet gets preserved - selecting the first would be fine, > but any other way to do it would be fine also. It /would/ be handy to also > get a list of the rejected triplets, if that's possible. Ideas? You could try this A <- cbind(xyz[[1]],xyz[[2]]) A indx <- which(duplicated(A)) indx lapply(xyz,function(u) u[-indx]) lapply(xyz,function(u) u[indx]) 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.
