[R] dynamically add items to key of lattice xyplot

[hadley wickham]

On Feb 5, 2008 3:50 AM, Bram Kuijper <a.l.w.kuijper at rug.nl> wrote:
> Hi all,
>
> is it possible to dynamically add key items to an already existing key,
> belonging to a lattice xyplot?

It's not lattice, but this is pretty easy to do with ggplot2:

install.packages("ggplot2")
library(ggplot2)

qplot(mpg, wt, data=mtcars, colour="1") +
geom_point(aes(x = mpg ^ 2, colour="2")) +
geom_point(aes(x=mpg^3, colour="3")) +
scale_colour_discrete("x power")

each time you add a new layer, all of the scale limits are
recalculated to ensure that all data is displayed.  You can read more
about ggplot2 at http://had.co.nz/ggplot2

Hadley

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