Re: lapply( *, names) -- bug ?!

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Subject: Re: lapply( *, names) -- bug ?!
From: Prof Brian D Ripley (ripley@stats.ox.ac.uk)
Date: Fri 23 Jul 1999 - 17:28:35 EST


Message-ID: <Pine.GSO.4.05.9907230823340.29439-100000@auk.stats>

On Fri, 23 Jul 1999, Martin Maechler wrote:

> This came on S-news
>
> The more direct test being
>
> sapply(c(a=1,b=2), names)
>
> Problem:
> R ("all" versions)
> behaves the same as S+5.1, which is wrong IMO.
>
> {since some might disagree, I didn't yet post to R-bugs ..}

I do. the argument is not a list, and lapply applies to lists. So
> as.list(c(a=1,b=2))
$a
[1] 1

$b
[1] 2

Fine. Note the names of the components are NULL.

>
> ------- Start of forwarded message -------
> Date: Thu, 22 Jul 1999 23:14:57 -0230
> From: "Paul Y. Peng" <ypeng@math.mun.ca>
> To: s-news <s-news@wubios.wustl.edu>
> Subject: [S] Feature or bug?
>
> In S-PLUS 3.3 (DEC Alpha) and S-PLUS 2000,
>
> > z <- c("a"=1, "b"=2)
> > lapply(z, function(x)names(x))
> $a:
> [1] "a"
>
> $b:
> [1] "b"
>
> But in S-PLUS 5.1 (Linux),
>
> > z <- c("a"=1, "b"=2)
> > lapply(z, function(x)names(x))
> $a:
> NULL
>
> $b:
> NULL
>
> Is this a new feature of S-PLUS 5? Do I miss anything in
> S-PLUS 5? Thank you for your help.
> ------- End of forwarded message -------
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
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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