R Control Grid Lines of Axes in ggplot2 Graphic (Example Code)

In this R programming tutorial you’ll learn how to control the grid lines of a ggplot2 graph.

Preparing the Example

data(iris)                     # Example data
head(iris)                     # Display head
#   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 package
my_plot <- ggplot(iris,        # Draw ggplot2 graphic with regular grid
                  aes(x = Sepal.Length,
                      y = Petal.Length)) +
  geom_point()
my_plot

r graph figure 1 r control grid lines axes ggplot2 graphic

Example: Adjust Major & Minor Grid Lines on X- and Y-Axes of ggplot2 Graph

my_plot +                      # Change major & minor grid lines
  theme(panel.grid.major.x = element_blank(),
        panel.grid.major.y = element_blank()) +
  scale_x_continuous(minor_breaks = seq(4, 6, 0.1)) +
  scale_y_continuous(minor_breaks = c(1.5, 5))

r graph figure 2 r control grid lines axes ggplot2 graphic

Further Resources & Related Tutorials

Below, you may find some further resources on topics such as plot legends, ggplot2, and graphics in R.

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