Drawing Grouped ggplot2 Barchart in R (Example Code)

In this article you’ll learn how to create a barchart with groups in R programming.

Preparing the Example

data(iris)                  # Creating example data sset
iris$group <- letters[1:2]
iris <- iris[ , c(1, 5, 6)]
head(iris)                  # Head of example data set
#   Sepal.Length Species group
# 1          5.1  setosa     a
# 2          4.9  setosa     b
# 3          4.7  setosa     a
# 4          4.6  setosa     b
# 5          5.0  setosa     a
# 6          5.4  setosa     b

Example: Create Grouped ggplot2 Barplot of Iris Flower Data

install.packages("ggplot2") # Install ggplot2 package
library("ggplot2")          # Load ggplot2
ggplot(iris,                # Drawing grouped barplot
       aes(x = Species,
           y = Sepal.Length,
           fill = group)) +
  geom_bar(stat = "identity",
           position = "dodge")

r graph figure 1 drawing grouped ggplot2 barchart

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