"Does anyone know how to use loop (or other methods) to create new columns? In SAS, I can use array to get it done. But I don't know how to do it in R."
Yup. Practically all users of R know how, as this is entirely elementary. You will too if you make the effort to go through a basic R tutorial, of which there are many on the web (and one shipped with R). Cheers, Bert On Mon, Mar 25, 2019 at 10:08 AM Yuan, Keming (CDC/DDNID/NCIPC/DVP) via R-help <r-help@r-project.org> wrote: > Hi All, > > I have a data frame with variable names like A_le, A_me, B_le, B_me, C_le, > C_me.... > if A_le=1 or A_me=1 then I need to create a new column A_new=1. Same > operation to create columns B_new, C_new... > Does anyone know how to use loop (or other methods) to create new columns? > In SAS, I can use array to get it done. But I don't know how to do it in R. > > Thanks, > > Keming Yuan > CDC > > > [[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.