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If you're creating a scientific graphic in the R language, there's a good chance you'll be wanting to include some mathematical symbols somewhere on the chart. You might want to use a symbol like μ as an axis label, annotate a curve with simple math like x^{2}, or even put a complete equation like:

in the title. You can do this easily in R using the plotmath syntax. Using escape sequences reminiscent of LaTeX, you can include beautifully-formatted mathematical symbols and equations in charts wherever you can place text. For example, the summation above can be added to a plot with an R statement like text(2,5,expression(sum(x[i], i=1, n)). This cheat sheet on mathematical annotation in R provides a guide to commonly-used symbols and equations, including: