Hi, I've two dataframe:
> snag_totale AREA snag_ha 1 2 1.628128 2 3 10.274249 3 4 2.778503 4 5 73.764307 5 7 12.015985 > log_totale AREA log_ha 1 1 22.29846 2 2 17.16889 3 3 48.80377 4 4 144.18996 5 5 70.30962 6 6 61.81850 7 7 13.24876 > How can I obtain a new data.frame, by the sum of value "snag_ha" + "log_ha" in the same "AREA"? Like this: AREA sum 1 1 22.29846 2 2 18.79702 3 3 59.07801 4 4 146.96847 5 5 144.07392 6 6 61.81850 7 7 25.26474 ______________________________________________ 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.
