label_bquote: Label with mathematical expressions

# NOT RUN { # The variables mentioned in the plotmath expression must be # backquoted and referred to by their names. p <- ggplot(mtcars, aes(wt, mpg)) + geom_point() p + facet_grid(vs ~ ., labeller = label_bquote(alpha ^ .(vs))) p + facet_grid(. ~ vs, labeller = label_bquote(cols = .(vs) ^ .(vs))) p + facet_grid(. ~ vs + am, labeller = label_bquote(cols = .(am) ^ .(vs))) # }