Change Number of Axis Tick Marks in ggplot2 Plot in R (Example Code)

In this tutorial you’ll learn how to adjust the number of axis ticks in a graphic in the R programming language.

Setting up the Example

data(iris)                     # Loading 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
install.packages("ggplot2")    # Install ggplot2 package
library("ggplot2")             # Load ggplot2
my_plot <- ggplot(iris,        # Drawing plot with default axis tick marks
                  aes(x = Sepal.Length,
                      y = Sepal.Width)) +
  geom_point()
my_plot

r graph figure 1 change number axis tick marks ggplot2 r

Example: Increasing the Number of Axis Tick Marks in a ggplot2 Graphic

my_plot +                      # Changing number of axis tick marks
  scale_y_continuous(breaks = scales::pretty_breaks(n = 15))

r graph figure 2 change number axis tick marks ggplot2 r

Further Resources

You may find some related R tutorials in the following list:

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