[R] Append text to panels of lattice::barchart()
p_connolly at slingshot.co.nz
Tue Nov 26 22:58:32 CET 2013
On 2013-11-27 10:07, Tim Sippel wrote:
> I could use a little help writing a panel function to append text to
> panel of a lattice::barchart(). Below is a modified version of the
> dataset to illustrate.
> # add a new variable called samp.size
> barley$samp.size<-round(runif(n=nrow(barley), min=0, max=50),0)
> # Below is a barchart plot for this example
> barchart(yield ~ variety | site, data = barley,
> groups = year, layout = c(1,6), stack = TRUE,
> auto.key = list(space = "right"),
> ylab = "Barley Yield (bushels/acre)",
> scales = list(x = list(rot = 45)))
> # I need to add to each panel the sum of samp.size by the groups
> (year) for that panel.
> # So the text appended to the top panel (Waseca) might say "1931=15,
> 1932=20", and same for each subsequent panel.
All you need is to modify the levels associated with the site factor.
Here's a trivial addition to give you the idea:
levels(barley$site) <- paste(levels(barley$site), LETTERS[1:6])
Then the same call you used will work. Of course, you'll need to do a
bit more than LETTERS[1:6] but I'm sure you know how to do that.
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