On 8/10/2008, at 5:16 PM, Deepayan Sarkar wrote:
On 10/7/08, Rolf Turner <[EMAIL PROTECTED]> wrote:
I am trying to do a histogram lattice plot and I would like the
histogram to be filled with a different colour in each panel.
Note: I want every bar in each histogram to be the same colour,
but that there should be different colours *between* histograms.
Can't seem to get this to work. I thought that something like
the following would be a goer:
set.seed(42)
X <- rnorm(200)
A <- factor(sample(letters[1:5],200,TRUE))
DF <- data.frame(x=X,a=A)
print(histogram(~x|a,data=DF,col=2:6,type="count",
panel=function(x,...,subscripts,col) {
panel.histogram(x,...,col=col[subscripts])
}))
However it somewhat mysteriously colours the first bar/rectangle
of the histogram appropriately in the last three panels, leaving
all of the others blank, and leaves all bars blank in the first
two panels.
That's because you are ending up with 'col[subscripts]' being a
vector, most elements of which are NA.
Can I do what I want? How?
print(histogram(~x|a,data=DF,col=2:6,type="count",
panel=function(x,...,col) {
panel.histogram(x,...,col=col[packet.number()])
}))
Works like a charm. Thanks very much. I guess I thought
I roughly understood what ``subscripts'' meant, and it seems
I don't understand at all. And I didn't know *anything* about
``packet.number()''. It would seem that I need to read your
book --- are these things explained there?
Thanks again.
cheers,
Rolf Turner
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