This recipe shows you how to get control over an axis within a ggplot plot.
The ggplot2
package does a great job of automatically setting the appearance of the axes, but sometimes, even in the early stages of your project, you may want your axis to appear in a specific shape, showing, for instance, a defined number of tickmarks.
This is what this recipe is all about—giving you control over the appearance of your ggplot
axes.
In this example, we will use a plot based on the Iris dataset.
The Iris dataset is one of most used datasets in R tutorials and learning sessions, and it is derived from a 1936 paper by Ronald Fisher, named The use of multiple measurements in taxonomic problems.
Data was observed on 50 samples of three species of the iris flower:
Iris setosa
Iris virginica
Iris versicolor
On each sample for features were recorded:
length of the sepals
width of the sepals
length of the petals
width of the petals
For a general and brief introduction...