R语言的画图功能手册。R语言的画图功能比较强，非常有用，对工作大有帮助。R是一个统计软件，开源。(R language drawing function manual. R language drawing function is relatively strong, very useful and helpful to the work. R is a statistical software that is open source.)

ggplot2包的书籍，学习统计绘图可以参考(Ggplot2 package refrence books, learning statistics drawing, you can refer to)