Show Only ggplot2 Legend without Graph in R (Example Code)
In this article you’ll learn how to draw only the legend of a ggplot2 graphic in R.
Preparing the Example
data(iris) # Load example data for plot 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 library("ggplot2") |
my_plot <- ggplot(iris, # Default ggplot2 scatterplot aes(x = Sepal.Width, y = Petal.Width, color = Species)) + geom_line() my_plot |
Example: Draw ggplot2 Legend without Plot Using grid, gridExtra & cowplot Packages
install.packages("grid") # Install grid package library("grid") # Load grid |
install.packages("gridExtra") # Install gridExtra package library("gridExtra") # Load gridExtra |
install.packages("cowplot") # Install cowplot package library("cowplot") # Load cowplot |
grid.newpage() # Draw only legend grid.draw(get_legend(my_plot)) |
Related Articles
In the following, you may find some additional resources on topics such as ggplot2, lines, graphics in R, and colors: