How to Modify X-Axis Labels of Boxplot in R (Example Code)

In this R tutorial you’ll learn how to modify boxplot axis labels.

Example Data

data(iris)                                 # Iris data set
iris_num <- iris[ , 1:4]                   # Extract numeric data
head(iris_num)                             # Head of data
#   Sepal.Length Sepal.Width Petal.Length Petal.Width
# 1          5.1         3.5          1.4         0.2
# 2          4.9         3.0          1.4         0.2
# 3          4.7         3.2          1.3         0.2
# 4          4.6         3.1          1.5         0.2
# 5          5.0         3.6          1.4         0.2
# 6          5.4         3.9          1.7         0.4

Example: Modify X-Axis Labels of Boxplot

boxplot(iris_num)                          # Boxplot of iris data set

r graph figure 1 modify x axis labels boxplot

boxplot(iris_num, names = letters[1:4])    # Change axis labels of boxplot

r graph figure 2 modify x axis labels boxplot

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