On Mar 10, 2010, at 5:43 AM, Achim Zeileis wrote:
On Wed, 10 Mar 2010, Christophe Genolini wrote:
Hi the list
I define a S3 function that can have a various number of argument
using '...'
When some arguments are missing, I would like to give them some
default value:
func.numeric <- function(x,...){
if(missing(y)){y<-3}
}
But it does not works...
I precise that I can not put 'y' explicitly in the argument list
since func is an S3 function, I cannot change its arguments.
Any suggestions?
If the generic func() has arguments "x" and "...", then you can
easily define a method func.numeric(x, y, ...). Methods need to
implement all arguments of a generic (including ...) but may add
additional argument.
I am assuming that one could also use the default assignment to y in
the argument list?
func.numeric(x, y=3, ...)
hth,
Z
Thanks
Christophe
David Winsemius, MD
West Hartford, CT
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