Draw ggplot2 Plot of Table Object in R (Example Code)

In this article, I’ll explain how to create a plot based on a table object in R programming.

Example Data

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
iris_tab <- table(iris$Species)               # Table of column
iris_tab
#     setosa versicolor  virginica 
#         50         50         50

Example: ggplot2 Plot of Table Converted to Data Frame

iris_df <- as.data.frame(iris_tab)            # Change class of data
iris_df                                       # Display data.frame in RStudio console
#         Var1 Freq
# 1     setosa   50
# 2 versicolor   50
# 3  virginica   50
install.packages("ggplot2")                   # Install ggplot2 package
library("ggplot2")                            # Load ggplot2 package
ggplot(iris_df, aes(x = Var1, y = Freq)) +    # Draw table
  geom_bar(stat = "identity")

r graph figure 1 draw ggplot2 table object

Further Resources

Have a look at the following R tutorials. They focus on topics such as graphics in R, ggplot2, and data objects.

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