Creating plots with the ggplot2 package
ggplot2
graphs are built iteratively, starting with the most basic plot. Additional layers are chained with the +
sign to generate the final plot.
To construct a plot we need at least data, aesthetics (color, shape, and size), and geoms (points, lines, and smooth). The geoms determine which type of graph is drawn. Facets can be added for conditional plots.
Getting ready
Download the files for this chapter and copy the auto-mpg.csv
file to your R working directory. Read the file using the read.csv
command and save in the auto
variable. Convert cylinders
into a factor
variable. If you have not done so already, install the ggplot2
package as follows:
> install.packages("ggplot2") > library(ggplot2) > auto <- ...
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