[R] Histogram colours in lattice.

hadley wickham h.wickham at gmail.com
Wed Oct 8 04:04:01 CEST 2008

On Tue, Oct 7, 2008 at 8:54 PM, Rolf Turner <r.turner at auckland.ac.nz> 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.
> Can I do what I want?  How?  Thanks for any advice (other than
> ``Go stick your head in a pig.'' :-) )

You could always use ggplot2:

qplot(X, data=DF, geom="histogram", fill=A, facets = . ~ a, binwidth=0.5)



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