" I did not pick up on by() doing the splitting for me when I read the help..."
>From ?by: "A data frame is split by row into data frames subsetted by the values of one or more factors, and function FUN is applied to each subset in turn." I do not understand how it could be more clearly stated than that. Care to elaborate? Did you run the examples? You should **always** do so. -- Bert On Mon, Sep 17, 2018 at 12:56 PM Rich Shepard <rshep...@appl-ecosys.com> wrote: > On Mon, 17 Sep 2018, MacQueen, Don wrote: > > > I'm also going to guess that maybe your object rainfall_by_site has > > already been split into separate data frames (because of its name). But > > by() does the splitting internally, so you should be passing it the > > original unsplit data frame. > > Don, > > I did not pick up on by() doing the splitting for me when I read the > help > file and a few web sites! > > Using the unsplit data.frame did the job; e.g., > > rainfall[, "name"]: Sandy 1.4 NE > [1] 0.1636066 > ------------------------------------------------------------ > rainfall[, "name"]: Sandy 1.7 SSW > [1] 0.2021324 > ------------------------------------------------------------ > rainfall[, "name"]: Sherwood 3.3 SE > [1] 0.1461752 > > Now I know how to properly apply by() to an unsplit dataframe. Thanks > for > the insightful lesson. > > Best regards, > > Rich > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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 -- To UNSUBSCRIBE and more, see 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.
