How to Reverse the Ordering of a ggplot2 Plot Legend in R (Example Code)

This article illustrates how to reverse the ordering of a ggplot2 plot legend in the R programming language.

Preparing the Example

data(iris)                     # Loading 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 ggplot2 package
library("ggplot2")             # Load ggplot2 package
my_plot <- ggplot(iris,        # Drawing ggplot2 plot with default legend
              aes(x = Sepal.Length,
                  y = Sepal.Width,
                  col = Species)) +
  geom_line()
my_plot                        # Draw plot

r graph figure 1 reverse ordering ggplot2 legend r

Example: How to Reverse the Order of a ggplot2 Legend

my_plot +                      # Reversing the legend order
  guides(col = guide_legend(reverse = TRUE))

r graph figure 2 reverse ordering ggplot2 legend r

Related Articles

In the following, you may find some additional resources on topics such as ggplot2, plot legends, and graphics in R:

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