I guess my problem is simple for most of you but I am new with R and I need some help, I have a dataframe :
CELLCD AreaProtected 8928 52.39389 8928 41.91511 8929 21.21975 8929 63.65925 8930 26.08547 8930 14.04602 I wouldlike to sum the AreaProtected if it is the same CELLCD in another column : CELLCD AreaProtected SumAreaProtected 8928 52.39389 94.309 8928 41.91511 8929 21.21975 84,879 8929 63.65925 8930 26.08547 8930 14.04602 I am just started with R and I don't know how I can do that. Do you have any ideas ? Thanks a lot for your help, -- View this message in context: http://r.789695.n4.nabble.com/Sum-with-condition-tp3972839p3972839.html Sent from the R help mailing list archive at Nabble.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.
