Hadley Wickham’s ggplot2[46] has become one of the most popular R packages. ggplot2 is a great tool for producing readable
charts. But more importantly, ggplot2
uses a language for describing how to plot data called the grammar
of graphics. In this chapter, I’ll explain how to use the grammar
of graphics to produce plots with ggplot2.
[46] There is also a ggplot package;
it was superseded by ggplot2. We
won’t cover ggplot in this
book.