Thanks for your reply. I thought anything about R questions can be posted here.
About your third point, what does it mean? I did the same thing before for other scripts, but this one does not work. Thanks again. On Sat, Mar 11, 2017 at 12:12 PM, Bert Gunter <bgunter.4...@gmail.com> wrote: > 1. Not reproducible, hence impossible to say. > > 2. This is r-help. RStudio is totally separate and its own support page. > > 3. A guess: Use are sourcing the entire script in the editor panel > into R, and there is something screwed up there. > > Cheers, > Bert > > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along > and sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Sat, Mar 11, 2017 at 10:50 AM, lily li <chocol...@gmail.com> wrote: > > Hi R users, > > > > I have a problem about using R studio. For example, there is a dataframe > > that has many columns. I want to aggregated column X and column Y into > > column Z. Column Z does not exist before the aggregation. I use the code > > below: > > df$Z = df$X + df$Y > > > > However, it does not work in the top left panel in Rstudio, and has the > > following warning message: > > Error in `$<-.data.frame`(`*tmp*`, "Z", value = numeric(0)) : > > replacement has 0 rows, data has 34333 > > > > If I type the same code in the Console panel (bottom left panel), it > works. > > How to deal with this problem? Thanks. > > > > [[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. > [[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.