[R] distinguish regression lines in grouped, black and white lattice xyplot

[Gabor Grothendieck]

Perhaps:

x <- 1:26
xyplot(x ~ x, groups = x, pch = letters, col = rainbow(26))


On Wed, Jun 24, 2009 at 3:28 PM, Katharina
May<may.katharina at googlemail.com> wrote:
> Hi,
>
> I've got the following problem which I cannot think of a solution right now:
>
> if got a lattice xyplot in black and white and a grouping variable
> with many (more than 8
> values) and I plot it as regression lines (type="r"), just like this
> one (not reproducable but that's
> I guess not the point here):
>
> xyplot(log(AGWB) ~ log(BM_roots), data=sub_agwb_data, groups=species,
> type="r", lty=c(1:6),panel=allo.panel.5)
>
> The problem is that I've got 26 different values for the grouping
> variable species and only 6 default values for the line type
> lty (and according to the par {graphics} help page customizable to up
> to 8 different line types).
>
> Does anybody have any idea how these 26 different lines can be made
> distinguishable from each other without the use
> of colors?
>
> Thanks,
>
>         Katharina
>
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