How to Draw Lines to gglot2 Graphic in R (4 Examples)

data(iris)                     # Loading example 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

data(iris) # Loading example 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 & load ggplot2 package
library("ggplot2")

install.packages("ggplot2") # Install & load ggplot2 package library("ggplot2")

my_plot <- ggplot(iris,        # ggplot2 graphic without lines
                  aes(Sepal.Length,
                      Sepal.Width)) +
  geom_point()
my_plot

my_plot <- ggplot(iris, # ggplot2 graphic without lines aes(Sepal.Length, Sepal.Width)) + geom_point() my_plot

my_plot +                      # Adding vertical line to plot
  geom_vline(xintercept = 5)

my_plot + # Adding vertical line to plot geom_vline(xintercept = 5)

my_plot +                      # Adding horizontal line to plot
  geom_hline(yintercept = 3)

my_plot + # Adding horizontal line to plot geom_hline(yintercept = 3)

my_plot +                      # Adding vertical & horizontal lines
  geom_vline(xintercept = 5) +
  geom_hline(yintercept = 3)

my_plot + # Adding vertical & horizontal lines geom_vline(xintercept = 5) + geom_hline(yintercept = 3)

my_plot +                      # Adding multiple lines to plot
  geom_vline(xintercept = seq(5, 7, by = 0.5))

my_plot + # Adding multiple lines to plot geom_vline(xintercept = seq(5, 7, by = 0.5))