On Tuesday 21 September 2004 08:41, Edzer Pebesma wrote:
> Jacques, please try the following:
> > z=factor(c('a', 'b','c'))
> > z
>
> [1] a b c
> Levels: a b c
>
> > x = c(1,2,3)
> > y = c(3,2,1)
> > xyplot(y~x,groups=z,auto.key=T,asp=diff(range(y))/diff(range(x)))
>
> the asp argument takes care of one unit in x being equal to one unit
> in y.
FWIW, In R 2.0.0 (currently beta), you can also do this with
aspect="iso".
> If you add e.g. pch=z to vary symbols, auto.key will have to be
> replaced by the more complex key argument, see ?xyplot
An alternative would be to change the settings (which is the only way
the panel function and auto.key can share information). Temporary
changes in settings can be attached to a trellis object as follows:
xyplot(y~x,groups=z,auto.key=T,asp=diff(range(y))/diff(range(x)),
par.settings =
list(superpose.symbol = list(cex = 2, pch = levels(z))))
Deepayan
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