oops, I think the right code would be x = get(varname) attr(x, "foo") = "bar" assign(varname, x)
On Wed, Oct 10, 2018 at 9:30 PM Peter Langfelder <peter.langfel...@gmail.com> wrote: > I would try something like > > x = get(myvarname) > attr(x, "foo") = "bar" > assign(varname, x) > > HTH, > > Peter > > On Wed, Oct 10, 2018 at 9:15 PM Marc Girondot via R-help < > r-help@r-project.org> wrote: > >> Hello everybody, >> >> Has someone the solution to set attribute when variable is known by name ? >> >> Thanks a lot >> >> Marc >> >> Let see this exemple: >> >> # The variable name is stored as characters. >> >> varname <- "myvarname" >> assign(x = varname, data.frame(A=1:5, B=2:6)) >> attributes(myvarname) >> >> $names >> [1] "A" "B" >> $class >> [1] "data.frame" >> $row.names >> [1] 1 2 3 4 5 >> >> # perfect >> >> attributes(get(varname)) >> >> # It works also >> >> $names >> [1] "A" "B" >> $class >> [1] "data.frame" >> >> $row.names >> [1] 1 2 3 4 5 >> >> attributes(myvarname)$NewAtt <- "MyAtt" >> >> # It works >> >> attributes(get(varname))$NewAtt2 <- "MyAtt2" >> Error in attributes(get(varname))$NewAtt2 <- "MyAtt2" : >> impossible de trouver la fonction "get<-" >> >> # Error... >> >> ______________________________________________ >> 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.
