Version info: Code for this page was tested in R Under development (unstable) (2012-07-05 r59734)
On: 2012-08-08
With: knitr 0.6.3
R allows users great flexibility in creating and formatting plots. Greek
letters can be included in titles and labels using the expression
command.
# Example 1 set.seed(1) # for reproducible, pseudo-random numbers betas <- rnorm(1000) hist(betas, main = expression(beta))
If we want Greek letters embedded in the text of a title or label, we can use
expression with paste:
# Example 2 h <- rnorm(mean = 5, sd = 1, n = 1000) hist(h, main = expression(paste("Sampled values, ", mu, "=5, ", sigma, "=1")))
par(mfrow = c(1, 2)) curve(dnorm, from = -3, to = 3, n = 1000, main = "Normal Probability Density Function") text(-2, 0.3, expression(f(x) == paste(frac(1, sqrt(2 * pi * sigma^2)), " ", e^{ frac(-(x - mu)^2, 2 * sigma^2) })), cex = 1.2) x <- dnorm(seq(-3, 3, 0.001)) plot(seq(-3, 3, 0.001), cumsum(x)/sum(x), type = "l", col = "blue", xlab = "x", main = "Normal Cumulative Distribution Function") text(-1.5, 0.7, expression(phi(x) == paste(frac(1, sqrt(2 * pi)), " ", integral(e^(-t^2/2) * dt, -infinity, x))), cex = 1.2)
