R How to Annotate Bold & Italic Text to ggplot2 Graph (2 Examples)

On this page, I’ll explain how to annotate bold and italic text to a ggplot2 graphic in the R programming language.

Setting up the Examples

data(iris)                 # 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 package
ggp <- ggplot(iris,        # ggplot2 graph without text
              aes(Petal.Length,
                  Sepal.Width)) +
  geom_point()
ggp

r graph figure 1 r annotate bold italic text ggplot2 graph

Example 1: Adding Bold Text to ggplot2 Graphic Using fontface = “bold”

ggp +                      # Add text element to plot
  annotate("text",
           x = 4,
           y = 4,
           size = 10,
           col = "orange",
           label = "This is my Text!",
           fontface = "bold")

r graph figure 2 r annotate bold italic text ggplot2 graph

Example 2: Adding Italic Text to ggplot2 Graphic Using fontface = “italic”

ggp +                      # Add text element to plot
  annotate("text",
           x = 4,
           y = 4,
           size = 10,
           col = "orange",
           label = "This is my Text!",
           fontface = "italic")

r graph figure 3 r annotate bold italic text ggplot2 graph

Related Articles & Further Resources

Please find some related R programming tutorials on topics such as text elements, graphics in R, and ggplot2 in the following list.

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