Yes, but the elephant in the room is: Define: "Identical."
If you do not know why this is an elephant, see FAQ 7.31. -- Bert On Thu, Mar 28, 2013 at 8:40 AM, Charles Berry <ccbe...@ucsd.edu> wrote: > Katherine Gobin <katherine_gobin <at> yahoo.com> writes: > > > > > Dear R forum > > > > Suppose I have a data.frame > > > > Say. > > [snip] > > > How to automatically identify and retain only one column (in this example > column x) among the identical > > columns besides other non-identical columns (viz. id, y and z). > > > See > > ?unique > > Details > > This is a generic function with methods for vectors, *data frames* and ... > > [emphasis added] > > So, > > unique( df, MARGIN=2 ) > > is what you want. > > HTH, > > ______________________________________________ > 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 [[alternative HTML version deleted]] ______________________________________________ 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.
