R Programming/Grammar of graphics

Hadley Wickham has developped the ggplot2, a graphical library designed according to the principles of the Grammar of Graphics.

Plotting a function

We use qplot() with the option stat=function :

# Plot the quadratic function
square <- function(x){
  x^2
}
mode(square)
qplot(c(0, 2), stat = "function", fun = square, geom = "line")

Here is another example with the sinus function  :

# plot the sinus functon
qplot(c(-10, 10), stat = "function", fun = sin, geom = "line")

Bibliography

• Leland Wilkinson, The Grammar of Graphics (Statistics and Computing), Springer, 2005
• Hadley Wickham, ggplot2: Elegant Graphics for Data Analysis, Use R!, Springer, 2009

Resources

• Documentation page for ggplot2