?aggregate 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 > aggregate(x$x2, list(x$x1), max) Group.1 x 1 a 4 2 b 3 3 c 2 4 f 5 5 g 4 >
On Thu, Oct 23, 2008 at 8:30 PM, Srinivas Iyyer <[EMAIL PROTECTED]> wrote: > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ 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.
