[Rd] replicating lists
Prof Brian Ripley
Wed, 11 Apr 2001 09:25:32 +0100 (BST)
On Wed, 11 Apr 2001, Jonathan Rougier wrote:
> Hi Everyone,
> At the moment it is not possible to replicate complex lists, but only
> simple ones:
> > rep(list(fred = 1:10), 10) # works fine
> > rep(list(fred = 1:10, happy = "squash"), 10)
> Error in rep(list(fred = 1:10, happy = "squash"), 10) :
> Unimplemented feature in rep
It is implemented in S3 and S4.
> There is nothing in ?rep that suggests that the latter should not work,
> and I think it would be a desirable feature if it did. For example, I
> want to create an array of lists, and it would be nice for me to set
> default values in the array function, rather than having to loop through
> the components and setting them individually.
> I've had a quick look in do_rep in seq.c and to my untrained eye it looks
> as though the LISTSXP case of the main switch might need to be replaced by
> a VECSXP, but I am not sure about other implications.
I suggest filing this as a bug report.
Brian D. Ripley, firstname.lastname@example.org
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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