R Draw Several ggplot2 Density Plots in Same Graphic (Example Code)

In this R programming tutorial you’ll learn how to plot several ggplot2 densities in the same graph.

Preparing the Example

data(iris)                       # Example data for plot
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example: Overlay Multiple Density Plots Using ggplot2 Package

install.packages("ggplot2")      # Install & load ggplot2
library("ggplot2")
ggplot(iris,                     # Draw ggplot2 density plot
       aes(x = Sepal.Width,
           fill = Species)) +
  geom_density(alpha = 0.7)

r graph figure 1 r draw several ggplot2 density plots same graphic

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