ggplot2 (version 2.1.0)

label_bquote: Backquoted labeller

Description

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.

Usage

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)))