It x is a list... do.call(fun,x)
You should keep external data input away from this code construct to avoid intentional or unintentional misuse of your fun. If your toy example were your actual usage I would suggest the collapse argument of paste. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. On January 15, 2015 6:25:43 AM PST, Rainer M Krug <rai...@krugs.de> wrote: > >Hi > >Following scenario: I have a function fun > >--8<---------------cut here---------------start------------->8--- >fun <- function(A, B, C, ...){paste(A, B, C, ...)} >--8<---------------cut here---------------end--------------->8--- > >and x defined as follow > >--8<---------------cut here---------------start------------->8--- >x <- 1:5 >names(x) <- LETTERS[x] >--8<---------------cut here---------------end--------------->8--- > >now I want to pass the *elements* of x to fun as named arguments, i.e. > >,---- >| > fun(A=1, B=2, C=3, D=4, E=5) >| [1] "1 2 3 4 5" >`---- > >The below examples obviously do not work: > >,---- >| > fun(x) >| Error in paste(A, B, C, list(...)) : >| argument "B" is missing, with no default >| > fun(unlist(x)) >| Error in paste(A, B, C, list(...)) : >| argument "B" is missing, with no default >`---- > >How can I extract from x the elements and pass them on to fun()? > >I could easily change x to a list() if this would be easier. > >--8<---------------cut here---------------start------------->8--- >x <- list(A=1, B=2, C=3, D=4, E=5) >--8<---------------cut here---------------end--------------->8--- > >In my actual program, x can have different elements as well as fun - >this is decided programmatically. > >Any suggestions how I can achieve this? > >Thanks, > >Rainer ______________________________________________ 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.