How to Adjust the Size of ggplot2 Legend Symbols in R (Example Code)

In this tutorial you’ll learn how to adjust the size of ggplot2 legend symbols in the R programming language.

Preparing the Example

data(iris)                                                                    # Load data
head(iris)                                                                    # Head of data
#   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
my_plot <- ggplot(iris, aes(x = Sepal.Length, Sepal.Width, col = Species)) +  # ggplot2 plot of iris
  geom_point()
my_plot                                                                       # Print plot

r graph figure 1 how adjust size ggplot2 legend symbols r

Example: Adjusting Size of Legend Symbols with guides Function

my_plot +                                                                     # Using guides function
  guides(color = guide_legend(override.aes = list(size = 5)))

larger size of symbols

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