Draw ggplot2 Plot Based On One Variable in R (Example Code)

In this tutorial, I’ll explain how to draw a single variable in a ggplot2 dotplot in R.

Setting up the Example

data(iris)                       # Load 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 ggplot2 package
library("ggplot2")               # Load ggplot2

Example: Draw One Variable in ggplot2 Scatterplot

ggplot(iris,                     # Plot only one variable
       aes(x = 1:nrow(iris),
           y = Sepal.Width)) +
  geom_point()

r graph figure 1 draw ggplot2 based on one variable r

Further Resources & Related Articles

Have a look at the following R programming tutorials. They explain topics such as ggplot2, plot legends, and graphics in R:

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