R help - Apr 2009 - args and test of passed paramters

Hi,
I would like to call a R script sometimes with:
  R --slave --vanilla --args Debug=1 N=25 < test.R 
and sometimes with
  R --slave --vanilla Debug=1 < test.R 
or similar.

Inside the R script I get the arguments with:

args=(commandArgs(TRUE))
if(length(args)==0){
  print("===    No arguments supplied. =============")
}else{
  for(i in 1:length(args)){
    eval(parse(text=args[[i]]))
  }
}

But I don't know, how can I test inside the script if the parameter N
was passed to script or not. I am looking for something like
is.defined(N), but I could not find it until now.

Any hint?

Juergen

Check out the getopt package.

On Fri, Apr 17, 2009 at 11:39 AM, Juergen Rose <rose at rz.uni-potsdam.de>
wrote:
> Hi,
> I would like to call a R script sometimes with:
> ?R --slave --vanilla --args Debug=1 N=25 < test.R
> and sometimes with
> ?R --slave --vanilla Debug=1 < test.R
> or similar.
>
> Inside the R script I get the arguments with:
>
> args=(commandArgs(TRUE))
> if(length(args)==0){
> ?print("=== ? ?No arguments supplied. =============")
> }else{
> ?for(i in 1:length(args)){
> ? ?eval(parse(text=args[[i]]))
> ?}
> }
>
> But I don't know, how can I test inside the script if the parameter N
> was passed to script or not. I am looking for something like
> is.defined(N), but I could not find it until now.
>
> Any hint?
>
> Juergen
>
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