A basic scatter plot has a set of points plotted at the intersection of their values along X and Y axes. Sometimes, we may wish to further distinguish between these points based on another value associated with the points. In this recipe we will see how we can group data points using color.
To try out this recipe, start R and type the recipe at the command prompt. You can also choose to save the recipe as a script so that you can use it again later on.
We will also need the
ggplot2 packages. The
lattice package is included automatically in the base R installation, but we will need to install the
ggplot2 package. To do this, run the following command at the R prompt: