Displaying the data density on axes
In this recipe, we will learn how to show the density of data points on a scatter plot in the margin of the X or Y axes.
For this recipe, we don't need to load any additional libraries.
How to do it...
We will use the
rug() function in the base graphics library. As a simple example to illustrate the use of this function, let's see the data density of a normal distribution:
x<-rnorm(1000) plot(density(x)) rug(x)
How it works...
As can be seen from this example, the
rug() function adds a set of lines just above the x-axis. A line or tick mark is placed wherever there is a point at that particular
X location. ...