[R] Working with additional input for user defined function

[Eik Vettorazzi]

Hi Christofer,
just have a look at how other functions deal with this, e.g.
> plot

function (x, y, ...)
{
#*snip*
        hasylab <- function(...) !all(is.na(pmatch(names(list(...)),
            "ylab")))
#*snip*

got it?
cheers

Am 01.02.2011 11:29, schrieb Bogaso Christofer:
> Hi all, suppose I have following user defined function:
> 
>  
> 
> fn1 = function(x, y, ...) {
> 
>                                 z <- x+y; u=y^2
> 
>                                 # if something with name "add" exists in the
> function argument then do some calculation and return that calculated value,
> NOT z
> 
>                                 # if NOT then return z
> 
>                                 return(z)
> 
>                 }
> 
>  
> 
> As you see in the function definition, I put open space " '.' syntax " , so
> that user can put additional argument. However here what I want to do is, if
> user have additional input then above function would do some ***special
> calculation*** and return that value.
> 
>  
> 
> How can I accomplice that?
> 
>  
> 
> Thanks and regards,
> 
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
Eik Vettorazzi
Institut für Medizinische Biometrie und Epidemiologie
Universitätsklinikum Hamburg-Eppendorf

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