Hi group, How can I identify an element with max value among duplicated elements all in a data frame
Example: > x1 x1 x2 1 a 4 2 b 3 3 c 2 4 a 1 5 c 2 6 f 3 7 g 4 8 f 5 I want to be able to get a data frame with all unique(x1) with max value x1 x2 1 a 4 2 b 3 3 c 2 5 c 2 7 g 4 8 f 5 Could I get some help please. thanks srini ______________________________________________ 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.
