On Tue, 7 Aug 2001 htang@hpl.hp.com wrote:
> Full_Name: Hsiu-Khuern Tang
> Version: 1.3.0
> OS: GNU/Linux (Debian unstable)
> Submission from: (NULL) (192.6.19.124)
>
>
> Hi all,
>
> I am not sure this is a bug rather than an intentional design, but here
> goes:
None of the above.
> If I do
>
> > a <- matrix(1:4, nrow=2)
> > dimnames(a)[[1]] <- c("a", "b")
>
> I get the following error message because dimnames(a) is NULL:
>
> Error: more elements supplied than there are to replace
Which is a correct error message.
> What is the proper way to do this?
rownames(a) <- c("a", "b")
> I know this works:
>
> > dimnames(a) <- list(c("a", "b"), NULL)
>
> Incidentally, in SPlus, I can assign to NULL dimnames.
Really? Your own example fails in the versions I have to hand:
S-PLUS 3.4 gives
> dimnames(a)[[1]] <- c("a", "b")
Error in dimnames(a) <- .A0: data of mode character can't be used as
dimnames
(need a list)
In addition: Warning messages:
Replacement length not a multiple of number of elements to replace in:
.A0[[1
]] <- .A1
Dumped
and S-PLUS 6.0 gives
> dimnames(a)[[1]] <- c("a", "b")
Problem in dimnames(a) <- .A0: Invalid length (1) for dimnames attribute;
needs to be 2
--
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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