From ggrothendieck at gmail.com  Fri Sep 29 18:50:37 2006
From: ggrothendieck at gmail.com (Gabor Grothendieck)
Date: Fri, 29 Sep 2006 12:50:37 -0400
Subject: [Rd] Warning: a final empty element has been omitted
In-Reply-To: <f8e6ff050609290920i69d88d0bseff9652efbdcb83d@mail.gmail.com>
References: <f8e6ff050609290920i69d88d0bseff9652efbdcb83d@mail.gmail.com>
Message-ID: <971536df0609290950v2c7c9e6h84bf44bb8e5dc5b7@mail.gmail.com>

Here is a kludge:

List <- function(...) {
	mc <- match.call()
	mc <- mc[as.list(mc) != ""]
	mc[[1]] <- as.name("list")
	eval(mc, parent.frame())
}

List(1,2,3,)


On 9/29/06, hadley wickham <h.wickham at gmail.com> wrote:
> How can I suppress this warning?
>
> > options(warn = -10)
> > list(1,2,3,)
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>   (1, 2, 3, )
> [[1]]
> [1] 1
>
> [[2]]
> [1] 2
>
> [[3]]
> [1] 3
>
> > suppressWarnings(list(1,))
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>   (1, )
> [[1]]
> [1] 1
>
>
> And can anyone add some insight as to why this warning was added?  It
> was nice to be able to use a construction like:
>
> a <- list(
>  b = 3,
>  c = 4,
> )
>
> so when you added a new line, you could just copy and paste an existing line.
>
> Hadley
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>




[Rd] Warning: a final empty element has been omitted
Gabor Grothendieck