[R] Stacked barchart color

[Deepayan Sarkar]

On 6/12/07, Dieter Menne <dieter.menne at menne-biomed.de> wrote:
> Dear Latticer,
>
> I want to give individual colors to all elements in a simple stacked
> barchart. I know why the example below does not work (and it is a excellent
> default), but is there any workaround for this?
>
> Dieter
>
>
> # This only colors red and green, but I want blue and gray for Peatland.
>
> barchart(yield ~ variety , groups=year, data = barley,  stack = TRUE,
>   subset=site=="Grand Rapids" & variety %in% c("Velvet","Peatland"),
>     col=c("red","green","blue","gray"))

The easiest way is to create a new factor with suitable levels: replace

groups=year

by

groups=year:variety

or the more verbose

groups=interaction(year, variety)

-Deepayan