[R] Setting rownames (was Please help.... i know its trivial)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Apr 17 08:47:11 CEST 2007
On Tue, 17 Apr 2007, Petr Klasterecky wrote:
> Patrick Callier napsal(a):
>> rownames is the command you want, I think.
>> rownames(A) <- seq(1:8)
> Yes. More generally
> rownames(A) <- 1:length(A[,1])
rownames(A) <- seq_len(nrow(A))
which works correctly if the length is 0 or there are zero columns, and is
Whenever you use 1:n you need to consider what you want if n <= 0.
> And keep in mind that nobody is going to help you next time, if you
> won't give a clear and informative SUBJECT in your message. Here it
> should have been something like 'wrong row names in subset' or
> 'dataframe subset question' etc, certainly not 'please help me, it's
> Btw, there is something like the posting guide for this list (see footer).
And please change the subject line to something appropriate when replying.
Brian D. Ripley, ripley at 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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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