Sorry... ?duplicated -- Bert
On Wed, Jul 25, 2012 at 1:28 PM, Bert Gunter <bgun...@gene.com> wrote: > ummm... > ?duplicates > > -- Bert > > On Wed, Jul 25, 2012 at 1:22 PM, David L Carlson <dcarl...@tamu.edu> wrote: >> duplicate <- ifelse(c(0, a$col[-length(a$col)])==c(a$col), 1, 0) >> >> ---------------------------------------------- >> David L Carlson >> Associate Professor of Anthropology >> Texas A&M University >> College Station, TX 77843-4352 >> >> >>> -----Original Message----- >>> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- >>> project.org] On Behalf Of Jeff >>> Sent: Wednesday, July 25, 2012 3:06 PM >>> To: r-help@r-project.org >>> Subject: [R] Simple question on finding duplicates >>> >>> >>> I'm trying to find duplicate values in a column of a data frame. >>> For >>> example, dataframe (a) below has two 3's. I would like to mark each >>> value of >>> each row as either not being a duplicate of the one before (0), or >>> as a >>> duplicate (1) - for example, as in dataframe (b). In SPSS, I would >>> simply >>> compare each value to it's "lagged" value, but I can't figure out >>> how to do >>> this with R. >>> Can someone point me in the right direction? >>> Thanks >>> a <- data.frame( col1 = c(1,2,3,3,4)) >>> b <- data.frame( col1 = c(1,2,3,3,4), duplicate = c(0,0,0,1,0)) >>> ______________________________________________ >>> 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. > > > > -- > > Bert Gunter > Genentech Nonclinical Biostatistics > > Internal Contact Info: > Phone: 467-7374 > Website: > http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.