replicating lists
The most obvious fix is internal, and that should be done fairly soon.
On Wed, 11 Apr 2001, David James wrote:
hi, Yes, I agree that the work-around needs some care, but I'm not sure we need to wrap the list itself -- we're simply using properties of "[" on lists. If the subscript is rep(1, 10), then we'll get the first element 10 times (which is *not* replicating the list). To get the replication we need to index every element in the list as many times as required. David
Date: Wed, 11 Apr 2001 15:28:02 +0100 (BST) From: Jonathan Rougier <J.C.Rougier@durham.ac.uk> X-Sender: dma0jcr@laplace To: David James <dj@research.bell-labs.com> cc: r-devel@stat.math.ethz.ch Subject: Re: [Rd] replicating lists MIME-Version: 1.0 On Wed, 11 Apr 2001, David James wrote:
A workaround is to use rep() inside "[":
a <- list(a=1, b=2, c=3) a[rep(1:3, 1:3)]
$a [1] 1 $b [1] 2 $b [1] 2 $c [1] 3 $c [1] 3 $c [1] 3 Note, however, that names are no longer unique!
This work-around is cunning but needs a bit of care, as to get the replication of the whole of fred you need to wrap the list itself:
fred <- list(happy = 1:10, fred = "squash") list(fred)[rep(1, 10)] # list with 10 copies of fred
Cheers, Jonathn. Jonathan Rougier Science Laboratories Department of Mathematical Sciences South Road University of Durham Durham DH1 3LE tel: +44 (0)191 374 2361, fax: +44 (0)191 374 7388 http://www.maths.dur.ac.uk/stats/people/jcr/jcr.html
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