Data columns types affect plot types
The plot from the previous exercise wasn't really satisfying. Although cyl (the number of cylinders) is categorical, you probably noticed that it is classified as numeric in mtcars. This is really misleading because the representation in the plot doesn't match the actual data type. You'll have to explicitly tell ggplot2 that cyl is a categorical variable.
This exercise is part of the course
Introduction to Data Visualization with ggplot2
Exercise instructions
- Change the
ggplot()command by wrappingfactor()aroundcyl. - Submit the code and see if the resulting plot is better this time.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Load the ggplot2 package
library(ggplot2)
# Change the command below so that cyl is treated as factor
ggplot(mtcars, aes(cyl, mpg)) +
geom_point()