[R] do.call("+", ...)

[Robin Hankin]

On 17 Nov 2006, at 14:14, Peter Dalgaard wrote:

[snip]

>
> so a+b+c is really (a+b)+c and I was calculating a+(b+c). That's
> actually a little bit harder because you don't get help from argument
> matching:
>
> "++" <- function(...) if ((n <- nargs()) == 1) ..1 else {
>     l <- list(...)
>     do.call("++",l[-n]) + l[[n]]
> }
>


Aha, the dreaded "..1" argument.   Where do I look for documentation  
on this?

[It is mentioned twice in The R Language Definition, but I'm no wiser]




--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743