jim holtman schrieb:
Try this:key <- rownames(a) key[key == "AT"] <- "TA" do.call(rbind, by(a, key, colSums))
something like paste(sort(strsplit(key, split="")[[1]]), "") might be more general. ______________________________________________ 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.
