[R] colname of ... arguments

[Duncan Murdoch]

On 11/03/2010 7:25 AM, ManInMoon wrote:
> Duncan,
>
> Thanks you - your deparse(substitute(...)) work - fantastic.
>
> But, when I pass in multiple arguments: f(z[,1],z[,2])
>
> I only show first argument, rest shows up as NULL
>   

Yes, that's because substitute has specific meanings for its two 
arguments, and only the first one makes sense for you.  If you want to 
see all the names, you're going to have to use sys.call(), and then pull 
out the pieces yourself.  For example:

 > f <- function(...) {
+   call <- sys.call()
+   print(deparse(call[[1]]))
+   print(deparse(call[[2]]))
+   print(deparse(call[[3]]))
+ }
 > f(a, b+c)
[1] "f"
[1] "a"
[1] "b + c"

Duncan Murdoch