Draw Line Segment & Curve in ggplot2 Plot in R (2 Examples)

In this post, I’ll demonstrate how to add line segments and curves to ggplot2 graphs in the R programming language.

Preparing the Examples

data(iris)                     # Loa 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 ggplot2 package
library("ggplot2")             # Load ggplot2 package
my_plot <- ggplot(iris,        # ggplot2 scatterplot
                  aes(x = Sepal.Length,
                      y = Sepal.Width)) +
  geom_point()
my_plot

r graph figure 1 draw line segment curve ggplot2 r

Example 1: Draw Line Segment in ggplot2 Plot Using geom_segment() Function

my_plot +                      # Modify color, size & linetype
  geom_segment(x = 5,
               y = 3,
               xend = 7,
               yend = 4,
               col = 2,
               size = 3,
               linetype = "dotted")

r graph figure 2 draw line segment curve ggplot2 r

Example 2: Draw Curve in ggplot2 Plot Using geom_curve() Function

my_plot +                      # Modify color, size & linetype
  geom_curve(x = 5,
               y = 3,
               xend = 7,
               yend = 4,
               col = 2,
               size = 3,
               linetype = "dotted")

r graph figure 3 draw line segment curve ggplot2 r

Related Tutorials

Below, you may find some additional resources on topics such as lines, graphics in R, and regression models:

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