R Force Origin of Axes in ggplot2 Plot to Start at Zero (Example Code)

In this R tutorial you’ll learn how to set the lower axis limit to zero.

Preparing the Example

data(iris)                     # Load iris 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 & load ggplot2 package
library("ggplot2")
my_plot <- ggplot(iris,        # Creating default ggplot2 graphic
                  aes(x = Sepal.Width,
                      y = Sepal.Length)) +
  geom_point()
my_plot                        # Drawing default ggplot2 graphic

r graph figure 1 r force origin axes ggplot2 start at zero

Example: Setting the Axis Origins of a ggplot2 Graph to Zero

my_plot +                      # Begin ggplot2 axes at zero
  scale_x_continuous(expand = c(0, 0),
                     limits = c(0, max(iris$Sepal.Width))) +
  scale_y_continuous(expand = c(0, 0),
                     limits = c(0, max(iris$Sepal.Length)))

r graph figure 2 r force origin axes ggplot2 start at zero

Related Articles & Further Resources

Please have a look at the following tutorials. They illustrate topics such as graphics in R, plot legends, and ggplot2.

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