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In some cases, we want to examine multiple plots with the same x or y axis in different side-by-side panels; qplot enables this using the facet_wrap() function or the facets argument.

# Visualize the relationship between city mpg and engine displacement
# for different classes of vehicles
ggplot(mpg, aes(displ, cty)) + geom_point() +
# The facet argument is helpful when we want to arrange the sub-plots
# in a specific order; below, we add new dataframe columns with more appropriate
# names for better labeling
mtcars$amf[mtcars$am==0] = "automatic"
mtcars$amf[mtcars$am==1] = "manual"
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