R Annotate Different Text to Each Facet in ggplot2 (Example Code)

This article illustrates how to annotate different text elements to each facet of a ggplot2 facet graph in the R programming language.

Setting up the Example

data(iris)                                        # Loading iris 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
my_plot <- ggplot(iris,                           # Default facet plot without text
                  aes(x = Petal.Width,
                      y = Petal.Length,
                      group = Species)) +
  geom_point() +
  facet_grid(. ~ Species)
my_plot

r graph figure 1 r annotate different text each facet ggplot2

Example: Adding Different Text Element to Each ggplot2 Facet

iris_text <- data.frame(label = c("Setosa Text",  # Data frame with text info
                                  "Versicolor Text",
                                  "Virginica Text"),
                        Species = names(table(iris$Species)),
                        x = c(1, 1.5, 1),
                        y = c(3, 6, 4))
iris_text
my_plot +                                         # Drawing different text to each facet
  geom_text(data = iris_text,
            mapping = aes(x = x,
                          y = y,
                          label = label))

r graph figure 2 r annotate different text each facet ggplot2

Related Articles & Further Resources

In the following, you can find some additional resources on topics such as ggplot2, labels, graphics in R, and text elements:

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