[R] Writing R package and do.call

[Rob Foxall]

Thanks Rolf,

I used your solution in my original, actual function and it worked
very fine and a much more sophisticated solution than what I
originally came up with! Thanks to the other people who replied as
well -- I know that the message said it was a "Note" rather than a
"Warning", but it sounds ominously like a warning, and so a little
part of me feels more secure now that I can avoid seeing it!

Cheers,
Rob.