Thank you, those are all viable solutions. Regards Luigi On Wed, Nov 30, 2022 at 8:59 PM Rolf Turner <r.tur...@auckland.ac.nz> wrote: > > > On Wed, 30 Nov 2022 13:40:50 +0100 > Luigi Marongiu <marongiu.lu...@gmail.com> wrote: > > > Hello, > > I have a data frame where some lines containing strings including > > digits. How do I select those rows and change their values? > > > > In essence, I have a data frame with different values assigned to the > > column "val". I am formatting everything to either "POS" and "NEG", > > but values entered as number should get the value "NUM". > > How do I change such values? > > > > What I do in such circumstances: > > suppressWarnings(X$val[!is.na(as.numeric(X$val))] <- "NUM") > > The "suppressWarnings()" bit is just included due to my OCD. > > This avoids fooling about with regular expressions, which always > requires a huge amount of trial and error, and a great diminishment of > the amount of hair on one's head (as a result of tearing out). > > Note that I have changed the name of your data frame from "df" to "X", > since df() is a built-in R function (density of the F-distribution). > > See fortunes::fortune("might clash"). > > cheers, > > Rolf Turner > > -- > Honorary Research Fellow > Department of Statistics > University of Auckland > Phone: +64-9-373-7599 ext. 88276 >
-- Best regards, Luigi ______________________________________________ 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.