Packages

In R, there are several packages that provide the visualization functionality to the programmer. We will use the following packages in the examples of this chapter:

• classIn: This contains univariate class intervals

• ggplot2: This has a large number of graphical features

• gpclib: This is used for polygon clipping

• hexbin: This is used for bivariate data manipulation

• latticist: This is an interface between R and the Latticist program

• mapdata: This has data that can be added directly to maps

• maps: This contains maps of various geographical areas

• maptools: This has the access mechanisms to use the maps

• playwith: This contains the interface between R and other programs, such as GTK+

• RColorBrewer: This is used for map shading

• RgoogleMaps: This contains the maps from Google for use in R

Interactive graphics

The R programming system interfaces with the GTK+ toolkit to allow the programmer to interactively modify a graphic. You can invoke the GTK+ toolkit using the playwith function. The playwith...