[Rd] rep fails on pairlist

[Gabor Grothendieck]

On Thu, Jul 26, 2012 at 4:24 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
>
> On 26 July 2012 at 15:55, Gabor Grothendieck wrote:
> | This code which has worked for years in R but fails under R-devel:
> |
> | > R.version.string
> | [1] "R Under development (unstable) (2012-07-25 r59963)"
> | >
> | > n <- 3
> | > f <- function(x) {}
> | > formals(f) <- rep(formals(f), n) ##
> | Error in rep(formals(f), n) : replication of pairlists is defunct
> |
> | The message suggests that the change was intentional.
> | Why was this functionality removed?
> | What code should be used in its place?
>
> FWIW there are changes happening right now to rep() so that may be spillage
> from code under development.  To keep abreast of these changes, I follow the
> RSS feed Duncan set up a few years ago -- it is also as html at
>
>    http://developer.r-project.org/blosxom.cgi/R-devel
>
> and summarizes changes committed to the NEWS file, ie high-level changes
> worth knowing about.

That page says:

Calling ‘rep()’ or ‘rep.int()’ on a pairlist or other non-vector
object is now an error.

so it again seems to be intentional.

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