Bill Dunlap TIBCO Software Inc - Spotfire Division wdunlap tibco.com
> -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Peng Yu > Sent: Thursday, October 01, 2009 7:42 PM > To: r-h...@stat.math.ethz.ch > Subject: [R] How to get duplicated items in a vector? > > Hi, > > > x=c(rep(1,3),rep(3,2)) > > x > [1] 1 1 1 3 3 > > duplicated(x) > [1] FALSE TRUE TRUE FALSE TRUE > > > > As shown in the above code, 'duplicated' doesn't return 'F' for the > first '1' and first '3' in 'x'. I am wondering if there is a function > that can return an indicator for any element whether it appears in a > vector twice or more. You could use is.element() or %in%, as in > x <- rep(3:1, 3:1) > x %in% x[duplicated(x)] [1] TRUE TRUE TRUE TRUE TRUE FALSE Bill Dunlap TIBCO Software Inc - Spotfire Division wdunlap tibco.com > > Regards, > Peng > > ______________________________________________ > 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. > ______________________________________________ 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.