On Aug 3, 2012, at 09:06 , Weijia Wang wrote: > Hi, > > Has anyone been able to figure out how to print all duplicated observations? > > I have a dataset, with patients ID, and other lab records. > > Some patients have multiple lab records, but 'duplicated' ID will only show > me the duplicates, not the original observation. > > How can I print both the original one and the duplicates?
Something like this? dd[ID %in% unique(ID[duplicated(ID)]),] Let's try: > ID <- sample(1:10, 10, replace=TRUE) > table(ID) ID 1 2 3 4 7 10 1 1 3 1 2 2 > ID[ID %in% unique(ID[duplicated(ID)])] [1] 7 7 10 3 3 3 10 The unique() bit is really just for efficiency: > ID[ID %in% ID[duplicated(ID)]] [1] 7 7 10 3 3 3 10 -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ 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.
