Changing levelplot labels in R

Question

I'm making a levelplot in R:

levelplot(cov(data.frame(a=c(1,2,3), b=c(4,5,6), c=c(1,5,9))))

Instead of the names on the plot being a, b, and c, I want them to be expressions, like

labels <- expression(alpha, beta, omega**2)

How can I put these labels in? Thanks.

Answer 1

You can pass the label to scales argument as a named list (see xyplot documentation).

library(lattice)

xy.labels <- expression(alpha, beta, omega**2)
levelplot(cov(data.frame(a=c(1,2,3), b=c(4,5,6), c=c(1,5,9))), scales = list(labels = xy.labels))