On Sun, Feb 10, 2013 at 9:06 PM, David Romano <drom...@stanford.edu> wrote: > Hi everyone, > > I ran into the issue below while trying to execute a command of the form > > apply(list.names,1, function(x) F(favorite.list$x) ) > > where list.names is a character vector containing the names of the elements > of favorite.list and F is some function defined on a list element. > > Namely, the $ operator doesn't treat the string variable 'x' as the string > it represents, so that, e.g. > >> ll <- list(ss="abc") >> ll$ss > [1] "abc" >> ll$"ss" > [1] "abc" > > but > >> name <- "ss" >> ll$name > NULL > > I can get around this by using integers and the [[ and [ operators, but I'd > like to be able to use names directly, too -- how would I go about doing > this? >
You've already found it: the bracket operators.... MW > Thanks for your help in clarifying what might be going on here. > > David > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. ______________________________________________ R-help@r-project.org mailing list 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.
