Learn R – How to Create Multiple Density Plots Using GGPlot

this article represents code samples which could be used to create multiple density curves or plots using ggplot2 package in r programming language. please feel free to comment/suggest if i missed one or more important points.

multiple density curves/graphs with ggplot

the code samples given below work for the “diamonds” dataset which is loaded as part of ggplot2 package . the following are two different types of plots shown below:

• density plot with multiple fills
• density plot with single fill

density plots with multiple fills

the following code represents density plots with multiple fills. pay attention to the “fill” parameter passed to “aes” method.

# create density plots for single variable filtered by fill condition
# in example below, fill is assigned to cut
ggplot(diamonds, aes(x=carat, fill=cut)) + geom_density() + 
  labs(title="density plot", x="carat")

density plot with single fill

following plot demonstrates the density plot with single fill.

# create density plot for single variable
ggplot(diamonds, aes(x=carat)) + geom_density(col="red", fill="yellow", alpha=0.4) + 
  labs(title="density plot", x="carat")