How to Apply the mtext() Function in R (Example Code)

This tutorial explains how to annotate text elements to the margins of a graphic using the mtext function in the R programming language.

Constructing 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
plot(iris$Sepal.Length,                       # Base R scatterplot
     iris$Petal.Length)

r graph figure 1 apply mtext function

Example: Basic Application of mtext() Function

plot(iris$Sepal.Length,                       # Base R scatterplot
     iris$Petal.Length)
mtext("Some additional text for my graph",    # Annotate text to plot
      side = 4,
      col = "purple",
      cex = 2)

r graph figure 2 apply mtext function

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