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.
