Try this:
foo <- function(data, ...)
{
### here I want to check whether xlab was passed with the ... arguments
### or if the ... arguments did not contain an xlab argument
args <- list(...)
return(ifelse("xlab" %in% names(args), "Exists", "Missing"))
}
On Thu, Dec 11, 2008 at 4:22 PM, Mark Heckmann <mark.heckm...@gmx.de> wrote:
> Hi,
>
> How can I check if a certain ... argument has been passed on to my
> user-defined function or not?
>
> foo <- function(data, ...)
> {
> ### here I want to check whether xlab was passed with the ... arguments
> ### or if the ... arguments did not contain an xlab argument
> }
>
> I tried missing(xlab) , exists(xlab) and several other things but did not
> find a solution.
>
> TIA,
> Mark
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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