> Whether or not what follows is to be recommended I don't know, but it
> seems to work,
>
> p <- ggplot(diamonds, aes(carat, ..density..)) +
> geom_histogram(binwidth = 0.2)
>
> x = quote(cut)
> facets = facet_grid(as.formula(bquote(.~.(x))))
> p + facets
That's what I'd recommend. You can also just do
facets <- facet_grid(paste(". ~ ", var))
Hadley
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