Can you provide an simple example of what you want the function to do?
Generally, I set some value in the default.
raise <- function(x, power=1){ return( x^power ) }
> raise(5)
[1] 5
> raise(5,3)
[1] 125
Or you can do the same but in a slightly unclear manner.
raise <- function(x, power){
if(missing(power)) power <- 1
return( x^power )
}
I prefer the former.
Regards, Adai
[EMAIL PROTECTED] wrote:
> Dear R users,
>
> I need to create a set of function to solve some tasks. I want to leave the
> operator to decide whether uses default parameters or change it; so the
> functions may have some optional fields. I tied to use the function
> missing(), but it will work properly only if the optional field is decleared
> at last in the function.
> Can you give me some suggestion an some reference?
>
> thank you.
>
>
> Claudio
>
>
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