R ggplot2 – How to Create Axis Breaks with Integers Only (Example Code)

This tutorial illustrates how to draw a ggplot2 axis containing only integers in the R programming language.

Preparing the Example

data(iris)                                                 # Iris 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
my_plot <- ggplot(iris, aes(Petal.Length, Petal.Width)) +  # Default ggplot2 plot
  geom_point()
my_plot                                                    # Showing plot in RStudio

r graph figure 1 r ggplot2 create axis breaks integers only

Example: Modify Axis Scales with pretty_breaks Function

install.packages("scales")
my_plot +                                                  # Nice scale values
  scale_y_continuous(breaks = pretty_breaks(3))            # Specify number of breaks

r graph figure 2 r ggplot2 create axis breaks integers only

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