[R] order of panels in xyplots

[Peter Ehlers]

Titus Malsburg wrote:
> The documentation of xyplot could be improved here.  It says:
> 
>   "If 'index.cond' is a list, it has to be as long as the number of conditioning
>    variables, and the 'i'-th component has to be a valid indexing vector for the
>    integer vector '1:nlevels(g_i)' (which can, among other things, repeat some
>    of the levels or drop some altogether)."
> 
> It should make explicit that nlevels is the number of levels actually
> used in the data and not length(levels(f)).
> 
It does say "... _valid_ indexing vector ..." (my emphasis).
If nlevels(g) = 5, but you're only plotting 3 panels, it seems
to me that c(3,1,5) might be a valid indexing vector.

  -Peter Ehlers

> Cheers,
> 
>    Titus
> 
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