On Aug 7, 2013, at 11:03 PM, David Winsemius wrote: > > On Aug 7, 2013, at 10:37 PM, Kevin Parent wrote: > >> Hoping someone here can help me with this small problem. >> set.seed(2013) >> >> x<-sort(c(letters,letters[sample(26,10,1)])) >> >> This gives a vector of 36 letters with some muliples (in this case, >> g,m,s,t,u,v,x,y). Now what I need is to get rid of the ones that only occur >> once and keep the multiples. I need the opposite of the unique() function. I >> expect this should be pretty easy but I can't see it. Anyone know a >> solution? Thanks in advance! >> >> > ?duplicated > > x[ duplicated(x) ] >
Also this may be of interest: cran.r-project.org/doc/contrib/Short-refcard.pdf ... but I was suprised to find that both duplicated and rle are absent from Short's refcards. -- David Winsemius Alameda, CA, USA ______________________________________________ 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.
