How can I add alpha-numeric AND greek characters to geom_text() in ggplot?

Question

I am trying to create a plot that is annotated with text that contains both alpha-numeric and greek characters. If I want to add just greek characters I can use:

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Answer 1

One solution: substitute tildes ~ for spaces.

d <- data.frame(x=1:3,y=1:3)
qplot(x, y, data=d) + geom_text(aes(2, 2,
              label="rho~and~some~other~text"), parse=TRUE)

Substituting * for ~ works if you want to juxtapose without spaces.

For the complete LaTeX solution I think you want to have a look at the tikzDevice package, possibly used in conjunction with knitr (the new coolest package on the block); e.g. see http://yihui.name/knitr/demo/graphics/