This practical guide provides more than 150 recipes to help you generate high-quality graphs quickly, without having to comb through all the details of R?s graphing systems. Each recipe tackles a specific problem with a solution you can apply to your own project, and includes a discussion of how and why the recipe works.Most of the recipes use the ggplot2 package, a powerful and flexible way to make graphs in R. If you have a basic understanding of the R language, you?re ready to get started.