There are functions in R that can be used to add to a plot once plot() has been run (or when plot() is run). Such functions can do things like add a regression line to a scatterplot or put text next to a point. In this chapter, those ancillary functions found in the graphics and stats packages are covered. The chapter is broken into four sections: the overall appearance, the functions assigning objects to locations, the functions that plot lines or line-like objects, and specialized functions.
There are a few arguments to plot.default() that were not covered in Chapter ...
