[R] extract elements
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jun 20 13:03:04 CEST 2007
On Wed, 20 Jun 2007, Manuele Pesenti wrote:
> Dear R users,
> just another little question... are there other ways, I mean more easy to
> write, to obtain the same result I got with:
>
> data[95:length(dati[,1]), ]
>
> where data is a data frame
>
> to extract the last elements starting from a fixed position?
data[95:nrow(data), ]
assuming 'data' and 'dati' are intended to be the same thing.
(Easier to read, too, and correct even if data[,1] is a matrix.)
--
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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