[R] Obtaining names of further arguments ('...')

[Arne Henningsen]

Hi,

I would like to obtain the names of all objects that are provided as further 
arguments ("...") in a function call. I have created a minimal example that 
illustrates my wish (but isn't useful otherwise):

f1 <- function( ... ) return( deparse( substitute( ... ) ) )

x1 <- 1
x2 <- 2
x3 <- 3

f1( x1, x2, x3 )
[1] "x1"

However, I would like to obtain the names of *all* further arguments, 
i.e. "x1", "x2", and "x3".

Is this possible in R? Does anybody know how to do this?

Thanks,
Arne

-- 
Arne Henningsen
Department of Agricultural Economics
University of Kiel
Olshausenstr. 40
D-24098 Kiel (Germany)
Tel: +49-431-880 4445 or +49-4349-914871
Fax: +49-431-880 1397
ahenningsen at agric-econ.uni-kiel.de
http://www.uni-kiel.de/agrarpol/ahenningsen/