Hi some example would be helpful.
r-help-boun...@r-project.org napsal dne 07.06.2010 09:01:27: > > Hey Everyone, > > I have been stumped by this all day. > > Basically, I have a data.frame of multiple columns. Of concern are "id" & > "date" > > For some reason, oftentimes there are duplicates of data with the same date. > > I would like to remove the duplicates per different id (removing duplicate > dates for the entire data.frame would leave nothing since different id's all > have the same dates) > > subset(x,!duplicated(x$date_)) works for just one ID, but i am having However if above works on one id so use split sapply/lapply approach. Split your data according to id and use sapply or lapply wit above function for splitted object. I believe this is what ddply does so maybe it can be used too. Regards Petr > trouble figuring out how to apply this to each subset of IDs (and retaining > the original data.frame structure) > -- > View this message in context: http://r.789695.n4.nabble.com/Subsetting- > subsets-of-data-frames-tp2245556p2245556.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. ______________________________________________ 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.