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

[Gabor Grothendieck]

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
>
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