On Sat, 23 Jun 2007, Gavin Simpson wrote:
> Dear list,
>
> I have a function whose first argument is '...'. Each element of '...'
> is a data frame, and there will be at least 2 data frames in '...'. The
> function processes each of the data frames in '...' and returns a list,
> whose components are the processed data frames. I would like to name the
> components of this returned list with the names of the original data
> frames.
>
> Normally I'd use deparse(substitute()) to do this, but here I do not
> know the appropriate argument to run deparse(substitute()) on, and doing
> this on ... only returns a single "name":
>
>> foo <- function(...)
> + deparse(substitute(...))
>> dat1 <- rnorm(10)
>> dat2 <- runif(10)
>> foo(dat1, dat2)
> [1] "dat1"
>
> Can anyone suggest to me a way to get the names of objects passed as
> the ... argument of a function?
That's a little tricky. The following may suffice:
foo <- function(...)
{
as.character(match.call())[-1]
}
The problem is that under certain circumstances match.call can give names
like '..2'
> bar <- function(...) foo(...)
> bar(dat1, dat2)
[1] "..1" "..2"
and I don't know a comprehensive R-level solution to that.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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