Re: [Rd] named empty list

From: Hervé Pagès <hpages_at_fhcrc.org>
Date: Fri, 04 Jun 2010 13:58:15 -0700

Thanks Martin. H.

Martin Maechler wrote:

>>>>>> "HP" == Hervé Pagès <hpages_at_fhcrc.org>
>>>>>>     on Thu, 03 Jun 2010 13:25:10 -0700 writes:

>
> HP> Hi,
> HP> I just realized that a named empty list is displayed the same
> HP> way as an empty list:
>
> >> list(aa=2:5)[0]
> HP> list()
> >> list()
> HP> list()
>
> HP> For empty atomic vectors, the print method makes the difference:
>
> >> c(aa=3L)[0]
> HP> named integer(0)
> >> integer(0)
> HP> integer(0)
>
> HP> Maybe lists could do that too?
>
> Yes, I agree. I have had at least one situation in the past
> where I had even been confused for a few minutes by this.
> I'm about to add it for R-devel [2.12.0] (only; considering it a
> new feature).
>
> Martin Maechler, ETH Zurich
-- 
Hervé Pagès

Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N, M2-B876
P.O. Box 19024
Seattle, WA 98109-1024

E-mail: hpages_at_fhcrc.org
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Fax:    (206) 667-1319

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