Label with mathematical expressions

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.

label_bquote(rows = NULL, cols = NULL, default = label_value)

Arguments

rows	Backquoted labelling expression for rows.
cols	Backquoted labelling expression for columns.
default	Default labeller function for the rows or the columns when no plotmath expression is provided.

See also

labellers, labeller(),

Examples

# 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)))