unique(): see its help page. (It has a data-frame method.)
On Wed, 9 Nov 2005, Bruno Cutayar wrote:
>
>
> Hello,
> with a data.frame like this :
> > toto <-
> data.frame(id=c("id1","id1","id2","id3","id3","id3"),dpt=c("13","13","34","30","30","30"))
> > toto
> id dpt
> 1 id1 13
> 2 id1 13
> 3 id2 34
> 4 id3 30
> 5 id3 30
> 6 id3 30
>
> what is the most efficient ways to obtain :
> id dpt
> 1 id1 13
> 2 id2 34
> 3 id3 30
> ?
> thanks in advance for your reply
> Bruno
--
Brian D. Ripley, [EMAIL PROTECTED]
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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