> Thank you for a clear example, it works. I tried to play with
> superpose.polygon before to no avail, this clarifies things.
You're welcome.
> Another question: would you know how to add gridlines to the plot?
> I'd like to have a few horizontal gridlines on my barchart plot for
> better readability. Do I have to write a wrapper for panel.barchart?
Probably, but it's not as bad as it sounds. To reuse the previous
example:
barchart(yield ~ site,
groups=variety,
data = barley,
panel=function(...){panel.barchart(...); panel.grid(v=0, ...)})
(The v=0 argument stop vertical grid lines being drawn.)
Regards,
Richie.
Mathematical Sciences Unit
HSL
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