Worked like a charm. Thanks. Zhongyi
On Wed, Jul 25, 2012 at 11:58 PM, MK <mkao006rm...@gmail.com> wrote: > Very simple > > mat[!duplicated(mat[, 1]), ] > > M [[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.