dat <- data.frame(id = c(1,1,1,2,2), value = c(5,6,7,4,5), value2 = c(1,4,3,3,4)) with(dat, dat[!duplicated(id),])
Michael On Sun, Sep 25, 2011 at 4:43 PM, AC Del Re <acde...@gmail.com> wrote: > Great but how can I then retain the other variable (or variables if >1) > value associated with those retained values? > thank you. > > On Sun, Sep 25, 2011 at 1:27 PM, R. Michael Weylandt < > michael.weyla...@gmail.com> wrote: > >> How about something like >> >> with(dat, value[!duplicated(id)]) >> >> ? >> >> Michael Weylandt >> On Sun, Sep 25, 2011 at 4:22 PM, AC Del Re <de...@wisc.edu> wrote: >> >>> Hi, >>> >>> I am trying to select the first row of a variable with data in >>> long-format, >>> e.g., >>> >>> # sample data >>> id <- c(1,1,1,2,2) >>> value <- c(5,6,7,4,5) >>> dat <- data.frame(id, value) >>> dat >>> >>> How can I select/subset the first 'value' for each unique 'id'? >>> >>> Thanks, >>> >>> AC >>> >>> [[alternative HTML version deleted]] >>> >>> ______________________________________________ >>> 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. >>> >> >> > [[alternative HTML version deleted]] ______________________________________________ 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.
