[R] alternative to table

[Andrea Peters]

Use
 unique(x[,1])
Andrea


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
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