Label with mathematical expressionsSource:
label_bquote() offers a flexible way of labelling
facet rows or columns with plotmath expressions. Backquoted
variables will be replaced with their value in the facet.
Backquoted labelling expression for rows.
Backquoted labelling expression for columns.
Unused, kept for compatibility.
# 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)))