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...I would like to be able to initialize it with something like NULL or NA (indicating that there is no information in the slot) but the value should comply with the fact that it must be of type call. Is there any simple way to obtain this? Thanks for any hint, Roberto -- <r/> | Roberto Brunelli - [scientist at Fondazione Bruno Kessler-irst] | 'Home can be anywhere, for it is a part of one's self' ------------------ ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler ITC -> since 1 March 2007 Fondazione Bruno Kessler

...t;- 1 > example(a, document = 1) [1] "Roberto" example(name = a, document = 1) > example(a, document = 2) [1] "Roberto" example(name = "Roberto", document = 2) > example(b, document = 2) [1] 1 example(name = b, document = 2) > -- <r/> | Roberto Brunelli - [scientist at Fondazione Bruno Kessler-irst] | 'Home can be anywhere, for it is a part of one's self' ------------------ ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler ITC -> since 1 March 2007 Fondazione Bruno Kessler

I'm trying to write a simple wrapper for plotting functions to make them print to postscript, something like ploteps <- function(file, plotFunction, ...) { args <- list(bquote(...)) # prepare postscript device do.call(plot, args) # close postscript device } I have inserted the bquote otherwise I get a lot of numbers in the plot when I plot/hist something. But if I invoke

How can I apply function f, that I get as an argument as in func <- function(f, ...) { . . . } to a list of arguments list(a, b, c) (eg the ... argument of func above) in order to obtain f(a, b, c) Thanks a lot, Roberto [[alternative HTML version deleted]]

I would like to port to R the IPAT-S language, kind of a 'domain specific' scripting language for developing quantitative models for medium and long-term sustainability scenarios (www.ipat-s.org). I think that in order to replicate its syntax I need some kind of 'macro' functionality to reparse it into R constructs. Are there any examples of tweaking R to support a domain specific