R help - Oct 2008 - colors in lattice histograms

I am using the lattice histogram

histogram( ~ base_var   | treatment, data=mydataset )

 In my dataset, the histogram produces (as expected) two histograms,
each corresponding to one of the two treatments.
 
 I would like to have the histogram for one treatment to have, say,  red
bars, the histogram for the second treatment,  to have blue bars.

I tried the ",col=" option, but that colors individual bars rather
than
the histogram.

Thanks in advance for suggestions.



    Chris Barker, Ph.D.
  Statistical Consultant


	[[alternative HTML version deleted]]

On Thu, Oct 30, 2008 at 4:10 PM, Barker, Chris <Chris.Barker at cvt.com>
wrote:
>
>
>  I am using the lattice histogram
>
> histogram( ~ base_var   | treatment, data=mydataset )
>
>  In my dataset, the histogram produces (as expected) two histograms,
> each corresponding to one of the two treatments.
>
>  I would like to have the histogram for one treatment to have, say,  red
> bars, the histogram for the second treatment,  to have blue bars.
>
> I tried the ",col=" option, but that colors individual bars
rather than
> the histogram.
Try

histogram(~ base_var   | treatment, data=mydataset
    panel = function(..., col) panel.histogram(..., col = c('red',
'blue')[packet.number()]))

-Deepayan