How to Add Lines & Points to a ggplot2 Plot in R (Example Code)

In this tutorial, I’ll illustrate how to draw a ggplot2 plot with points and lines in the R programming language.

Setting up the Example

data(iris)                           # Example data frame
head(iris)                           # Head of example data
#   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")

Example: Drawing Lines & Points in ggplot2 Graphic

ggplot(iris,                         # Create ggplot2 graph
       aes(x = Sepal.Length,
           y = Petal.Length,
           col = Species)) +
  geom_point() +                     # Adding points
  geom_line()                        # Adding lines

r graph figure 1 add lines points ggplot2

Related Tutorials & Further Resources

In the following, you can find some further resources on topics such as variables, graphics in R, and ggplot2.

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