[R] [SOLVED] Re: Use of the dot.dot.dot option in functions.

From: KENNETH R CABRERA <krcabrer_at_une.net.co>
Date: Wed, 06 Apr 2011 14:00:58 -0500

Thank you very much for your help.

It works very well!

Still, it is not very clear why the "replicate" function do not take the "..." arguments like they should.

> On 06/04/2011 12:04 PM, KENNETH R CABRERA wrote:
> >Hi R users:
> >
> >I try this code, where "fun" is a parameter of a random generating
> >function name, and I pretend to use "..." parameter to pass the
> parameters>of different random generating functions.
> >
> >What am I doing wrong?
> >
> >f1<-function(nsim=20,n=10,fun=rnorm,...){
> > vp<-
> replicate(nsim,t.test(fun(n,...),fun(n,...))$p.value)> return(vp)
> >}
> >
> >This works!
> >f1()
> >f1(n=20,mean=10)
> >
> >This two fails:
> >f1(n=10,fun=rexp)
> >f1(n=10,fun=rbeta,shape1=1,shape2=2)
> >
> >Thank you for your help.
>
>
> I imagine it's a scoping problem: replicate() is probably not
> evaluating the ... in the context you think it is. You
> could debug this by writing a function like
>
> showArgs <- function(n, ...) {
> print(n)
> print(list(...))
> }
>
> and calling f1(n=10, fun=showArgs), but it might be easier just
> to avoid the problem:
>
> f1 <- function(nsim=20,n=10,fun=rnorm,...){
> force(fun)
> force(n)
> localfun <- function() fun(n, ...)
> vp<-replicate(nsim,t.test(localfun(),
> localfun())$p.value) return(vp)
> }
>
>

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