[R] Obtaining names of ``...'' arguments.

[Rolf Turner]

This may be an FAQ, but a (perfunctory) search failed to turn it up.

Suppose I have a function foo(...){<something>} and I want to obtain,
inside foo, the names of items comprising the ``...''.  E.g. if I
call

	foo(melvin,clyde,irving)

I want to be able to loop through the ``...'' and successively obtain
the text strings "melvin", "clyde", and "irving".

Is there any way to do this?

I know that if I had a function foo(x,y,z){<something>}, and I called
foo(melvin,clyde,irving), I could get the text strings I want by
means of

	deparse(substitute(x)) # Giving "melvin".
	deparse(substitute(y)) # Giving "clyde".
	deparse(substitute(z)) # Giving "irving".

but if foo() is to take an arbitrary number of arguments then this
sort of syntax is not available.

					cheers,

						Rolf Turner
						rolf at math.unb.ca
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