Greek letters in ggplot strip text

Question

I\'m trying to override the text in some ggplot strips to incorporate Greek characters. Here\'s some sample data, and the base for the plot.

dfr <- data.         


        

Answer 1

posting this here since it's related:

If you want the name of the variable itself as well as the levels/values of the variable to be evaluated as an expression (i.e. rendered as if they were latex), try this:

label_parseall <- function(variable, value) {
    plyr::llply(value, function(x) parse(text = paste(variable, 
        x, sep = "==")))
}

Example:

data <- data.frame(x = runif(10), y = runif(10), 
    gamma = sample(c("gamma[0]", "gamma[1]"), 10, rep = T))
ggplot(data, aes(x, y)) + geom_point() + facet_grid(~gamma, 
    labeller = label_parselabel) 

image at http://img709.imageshack.us/img709/1168/parseall.png