Greek characters in ggplot2: geom_boxplot

Question

I am trying to put Greek characters in my boxplot made in ggplot2. However, having gone through all the previous questions about stack overflows, I cannot get any of my examples for work for life.

So I apologize for the repost, but if someone can help me, I will be very grateful.

My code so far:

## Data
names = LETTERS[1:3]
x = runif(99)
y = rep(names, length = length(x))
Parameters = factor(rep(c("Lambda", "Phi", "Gamma"), each = length(names)), 
                    levels = c("Lambda", "Phi", "Gamma"))
plot.df = data.frame(x, y, Parameters)
limits = quantile(plot.df[,1], probs = seq(0.1,0.9,by=0.1))
##Create Plot
dodge = position_dodge(width=0.5)
p = ggplot(plot.df, aes(x = y,y = x, colour = Parameters)) +
    geom_boxplot(aes(shape = Parameters), outlier.shape = 19, outlier.colour = NULL, outlier.size = 0.8) +
        scale_shape_manual(values = rep(19, 3)) +
            scale_y_continuous(limits = c(0, 1)) +
                coord_flip() + labs(title = "TITLE", x = "", y = "") + 
                xlim(rev(names)) +
                theme(legend.position = "right")
print(p)

What gives:

There are several bits in the code needed for my real data (i.e. reorganization of the x axis (which is the y axis), etc.)

I want the legend to change to Greek letters, but I am absolutely fixated on how to do this.

thanks

Answer 1

Continue with the script,

my.labs <- list(bquote(lambda),bquote(phi),bquote(gamma))

p <- p+
  scale_colour_manual(values=1:3,breaks=c("Lambda", "Phi", "Gamma"),
                      labels=my.labs)+
  scale_shape_manual(values=rep(19, 3),breaks=c("Lambda", "Phi", "Gamma"),
                      labels=my.labs)
print(p)

More details

• Plotmath
• ggplot2?