dear R experts---I am trying to figure out what the recommended way is to merge by() results back into the original data frame. for example, I want to have a flag that tells me whether a particular row contains the maximum for its group.
d <- data.frame(group=as.factor(rep(1:3,each=3)), val=rnorm(9)) highestvals <- by( d, d$group, function(d)(max(d$val)) ) ## and now? iterate over levels( d$group ) ? how do I merge highestvals back into d? advice appreciated. sincerely, /iaw ---- Ivo Welch (ivo.we...@brown.edu, ivo.we...@gmail.com) ______________________________________________ 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.
