On Jan 22, 2012, at 10:39 PM, Marcin Kozak wrote:
Hi all,
I wanted to do something of this sort:
library(lattice)
label <- expression(alpha)
xx <- substitute(expression(lab %+-% type), list(lab = label, type =
" type"))
stripplot(Species ~ jitter(Petal.Length), iris, ylab = xx,
horizontal=T)
Try instead:
label <- quote(alpha)
xx <- substitute(expression(lab %+-% type), list(lab = label, type = "
type"))
stripplot(Species ~ jitter(Petal.Length), iris, ylab = xx, horizontal=T)
When you nest an expression call inside an expression things do not go
well.
And quote(alpha) is not the same as "alpha".
(The example plot itself does not make much sense, but I need only to
construct the label.) Since I want to make it a general function, I
need to have both these expressions (the "lab" and "type" arguments
sometimes are and other times are not expressions, but I must assume
such a possibility). Unfortunately, the above code does not work, that
is, does not produce a label that should say "alpha +- type" [alpha in
Greek]. The first part (the alpha) is ignored at all. Any idea how to
do that?
I work with R 12.1, Windows 7.
Best wishes,
Marcin
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