In
library(ggplot2) library(reshape) df <- as.data.frame(matrix(runif(9),3,3)) df$factor <- letters[1:3] df.m <- melt(df) ggplot(df.m, aes(variable
You can specify the type of labeller here using label_parsed,
labeller
label_parsed
new.lab <- as_labeller(c(a="A", b="B", c="italic(C)"), label_parsed) ggplot(df.m, aes(variable, value)) + geom_boxplot() + facet_wrap(~factor, labeller = new.lab)