Latex and variables in plot label in R?

Question

How do I use variables in Latex expressions in R?

For example:

plot(X, Y, main=expression(R^2))

Will put R with a nice superscripted 2

Answer 1

tikz and psfrag allow you to use actual LaTeX code and output instead of plotmath's, resulting in better typographic consistency.

See this question for details. Getting LaTeX into R Plots