Mathematical expressions in plots

Mathematical expressions can be included in the plot title or axis labels. For more information, see ?plotmath or run the demo with demo(plotmath).

Here are some quick examples.

Example 1

plot(0, 0, main = expression(theta == 0), ylab = expression(hat(gamma) == 0), 
    xlab = expression(sum(x[i] * y[i], i == 1, n)))

plot of chunk example1

Example 2

Strings can be pasted together with mathematic expressions:

x <- rnorm(100)
hist(x, xlab = expression("The mean (" * bar(x) * ") is " * sum(x[i]/n, i == 
    1, n)))

plot of chunk example2

Example 3

The subsitute function can be used to substitute values into a mathematical expression.

x <- rnorm(100)
y <- x + rnorm(100, sd = 0.5)
plot(x, y, xlab = substitute(bar(x) == k, list(k = mean(x))), ylab = substitute(bar(y) == 
    k, list(k = mean(y))))

plot of chunk example3

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