On Sun, Nov 4, 2012 at 3:10 AM, andrewH <ahoer...@rprogress.org> wrote: > Yes, the assign command goes a little way toward what what I was hoping for. > But it requires a different syntax, and it does not in general let you use > quoted expressions that you could use with other assignment operators. For > instance, > >> DD <- 1:3 >> assign("DD[2]", 5) >> DD > [1] 1 2 3 > > So I am still looking for a function that produces an output that is fully > equivalent to the string without quotation marks. Or for a definite > statement that no such function can exist. >
I'm not sure what you mean without quotation marks, but here's a germ of a solution along your original doppl: doppl <- function(x) get(x, 1) `doppl<-` <- function(x, value) assign(x, value, 1) ## Note that I don't have the search path right and it really should ## have a parent.frame / sys.call things in there, but I'm not at my ## own machine right now to test. However, I don't think you can use this idiom as easily: doppl(x)[3] <- 5 because complex sub-assignment does some funny things. Happy to be proven wrong. Cheers, Michael ______________________________________________ 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.