Hi
Thomas Zumbrunn wrote:
Dear R users
I have problems horizontally aligning labels in keys of lattice plots when the
labels make use of plotmath. Here's a self-contained example:
dat <- data.frame(x = rnorm(10),
y = rnorm(10),
z = factor(rep(c("a", "b"), each = 5)))
xyplot(y ~ x, dat, groups = z,
auto.key = list(columns = 2,
text = c(expression(plain("alright")),
expression(italic("too low")))))
It seems like the grid object which the lattice function creates from the key
arguments has different heights for the two labels since the second label does
not stretch over the baseline.
I think the basic problem here is that mathematical expressions work
with the limits of bounding boxes rather than an overall baseline. A
workaround is to use phantom() within the expression to introduce
elements with a consistent height that are not actually drawn. For
example ...
xyplot(y ~ x, dat, groups = z,
auto.key = list(columns = 2,
text = c(expression(plain("alright")*phantom("hg")),
expression(italic("too low")*phantom("hg")))))
... which forces both expressions to go as high as the top of an "h" and
as low as the bottom of a "g" without those characters being drawn
(although space is allowed for those characters so you get a bit of
blank horizontal space).
Paul
Any ideas how I could circumvent the problem (other than manipulating the key
grob)?
Best wishes
Thomas Zumbrunn
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Dr Paul Murrell
Department of Statistics
The University of Auckland
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and provide commented, minimal, self-contained, reproducible code.
