On Tue, 3 Jul 2001 tomsv193 at student.liu.se wrote:
> Why is the rows-indicies effected by ordering?
Those are row names, not row indices.
> Example:
>
> (data=)
> name age
> 1 peter 13
> 2 eric 15
> 3 daniel 14
>
> #ordering by name...
>
> name age
> 3 daniel 14
> 2 eric 15
> 1 peter 13
>
> why not:
>
> name age
> 1 daniel 14
> 2 eric 15
> 3 peter 13
>
> Does it effect other operations? data[,1] really gives the 1:st row,
> but when data is printed it says that the first row have index 3...
*row name* 3. Indices are printed like [3,] as in
> matrix(1:9, 3)
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
Try a data frame like swiss with real names (in 1.3.0) rather than names
which happen to be 1:nrow(df).
--
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
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