Using Real Values as Axis Ticks of Plot in R (Example Code)

In this article, I’ll show how to use the real values of a plot as axis ticks in the R programming language.

Creating 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$Sepal.Length,        # Plotting default scatterplot
     iris$Sepal.Width)

r graph figure 1 using real values as axis ticks r

Example: Applying axis() & seq() Functions to Create Scatterplot with Manually Specified Y-Axis

plot(iris$Sepal.Length,        # Scatterplot without y-axis 
     iris$Sepal.Width,
     yaxt = "n")
axis(2,                        # Using axis() function
     at = iris$Sepal.Width)

r graph figure 2 using real values as axis ticks r

Further Resources & Related Articles

In addition, you might want to read the other articles of this website. I have released numerous other articles on topics such as ggplot2, graphics in r, and labels.

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