How to Modify the Labels of ggplot2 Plot Legend in R (Example Code)
In this tutorial you’ll learn how to change the item text of a ggplot2 legend in R.
Setting up the Example
data(iris) # Load iris data set 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 & load ggplot2 package library("ggplot2") |
my_plot <- ggplot(iris, # Create default ggplot2 plot aes(x = Sepal.Width, y = Sepal.Length, col = Species)) + geom_point() my_plot # Draw ggplot2 plot |
Example: Change Legend Labels of ggplot2 Plot Using scale_color_manual Function
my_plot + # Modify labels and colors scale_color_manual(labels = c("Species A", "Species B", "Species C"), values = c("gray", "orange", "purple")) |
Related Tutorials & Further Resources
Have a look at the following R tutorials. They illustrate similar topics as this post: