Mastering the grammar

You can choose to use just qplot(), without any understanding of the underlying grammar, but if you do you will never be able to unlock the full power of ggplot2. By learning more about the grammar and its components, you will be able to create a wider range of plots, as well as being able to combine multiple sources of data, and customise to your heart’s content. You may want to skip this chapter in a first reading of the book, returning when you want a deeper understanding of how all the pieces fit together.