R How to Increase / Decrease the Plot Legend Size (2 Examples)

In this post you’ll learn how to increase or decrease the legend size in a graphic in the R programming language.

Introducing Example Data

data(iris)                         # Iris as example data set
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
plot(x = iris$Sepal.Length,        # Basic plot in R
     y = iris$Sepal.Width,
     pch = 16,
     col = iris$Species)
legend("topright",                 # Creating legend
       legend = levels(iris$Species),
       pch = 16,
       col = 1:3)

r graph figure 1 r increase decrease legend size

Example 1: Adding Legend with Larger Size

plot(x = iris$Sepal.Length,        # Basic plot in R
     y = iris$Sepal.Width,
     pch = 16,
     col = iris$Species)
legend("topright",                 # Creating legend
       legend = levels(iris$Species),
       pch = 16,
       col = 1:3,
       cex = 2.2)                  # Increasing size of legend area

r graph figure 2 r increase decrease legend size

Example 2: Adding Legend with Smaller Size

plot(x = iris$Sepal.Length,        # Basic plot in R
     y = iris$Sepal.Width,
     pch = 16,
     col = iris$Species)
legend("topright",                 # Creating legend
       legend = levels(iris$Species),
       pch = 16,
       col = 1:3,
       cex = 0.6)                  # Decreasing size of legend area

r graph figure 3 r increase decrease legend size

Related Tutorials & Further Resources

Below, you can find some further resources that are related to the topic of this post.

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