On 7/25/07, Kevin Wright [EMAIL PROTECTED] wrote:
When I create a dotplot in lattice, I frequently observe overplotting
of the labels along the vertical axis. On my screen, this illustrates
overplotting of the letters:
windows()
reps=6
dat=data.frame(let=rep(letters,each=reps), grp=rep(1:reps, 26),
y=runif(26*reps))
dotplot(let~y|grp, dat)
Is there a way to automatically scale the labels so that they are not
over-plotted?
Not that I can think of.
I currently do something like this:
Calculate or guess the number of panel rows: NumPanelRows
cexLab - min(1, .9*par()$pin[2]/
(nlevels(dat$let)*NumPanelRows*strheight(A,units=in)))
dotplot(..., scales=list(y=list(cex=cexLab))
Is there an easier way?
Is there a function that I can call which calculates the layout of the
panels that will be used in the dotplot?
Not really. The eventual layout is calculated inside print.trellis as
follows (where 'x' is the trellis object being plotted):
panel.layout -
compute.layout(x$layout, dim(x), skip = x$skip)
[...]
if (panel.layout[1] == 0)
{
ddim - par(din)
device.aspect - ddim[2] / ddim[1]
panel.aspect - panel.height[[1]] / panel.width[[1]]
plots.per.page - panel.layout[2]
m - max (1, round(sqrt(panel.layout[2] * device.aspect /
panel.aspect)))
n - ceiling(plots.per.page/m)
m - ceiling(plots.per.page/n)
panel.layout[1] - n
panel.layout[2] - m
}
-Deepayan
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