Draw ggplot2 Graphic with Marginal Plot in R (Example Code)

In this article, I’ll illustrate how to add a marginal plot to a ggplot2 graphic in the R programming language.

Setting up the Example

data(iris)                     # Import example data
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
install.packages("ggplot2")    # Install & load ggplot2
library("ggplot2")
my_plot <- ggplot(iris,        # Draw ggplot2 plot without marginal plot
                  aes(x = Petal.Length,
                      y = Sepal.Length,
                      col = Species)) +
  geom_point() +
  theme(legend.position = "bottom")
my_plot

r graph figure 1 draw ggplot2 graphic marginal r

Example: Draw ggplot2 Scatterplot & Marginal Histogram Using ggMarginal() Function of ggExtra Package

install.packages("ggExtra")    # Install ggExtra package
library("ggExtra")             # Load ggExtra
ggMarginal(my_plot,            # Apply ggMarginal function
           type = "histogram",
           groupColour = TRUE,
           groupFill = TRUE)

r graph figure 2 draw ggplot2 graphic marginal r

Related Tutorials & Further Resources

You may find some related R tutorials below.

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