[R] alternative to table

[ripley@stats.ox.ac.uk]

?unique.

On Wed, 15 May 2002, Jan Malte Wiener wrote:

> hi,
> i have a matrix with repeated measures of subjects, e.g. (col 1 =
> subject, col 2 = data)
>
> x=
> 1	7
> 1	6
> 1	9
> 2	8
> 2	9
> 2	2
> 3	4
> 3	5
> 3	3
>
> i now would like to have a vector that only carries the different values
> of column 1 (only one entry per value -> (1,2,3)).
> right now i am doing this with:
>
> a<-table(x[,1])
> a<-names(a)
>
> that works rather fine, but "a" now carries characters not numbers.
> Since I want to use that vector to extract the data of individual
> subjects from "x", I either have to convert characters to numbers (not
> elegant) or find a different function that solves my problem.
> any ideas ?
>
> thanks,
> jan
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._