Draw Different Lines to ggplot2 Facet Grid in R (Example Code)
In this tutorial you’ll learn how to annotate different lines to a ggplot2 facet grid in R programming.
Setting up the Example
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 |
my_plot <- ggplot(iris, # Draw ggplot2 facet grid aes(x = Petal.Width, y = Sepal.Length)) + geom_point() + facet_grid(~ Species) my_plot |
Example: Annotate Different Lines to ggplot2 Facet Plot
iris_vline <- data.frame(Species = unique(iris$Species), # Specify data with line parameters lines = c(1, 2.2, NA), colors = c(2, 3, NA), sizes = c(5, 2, NA)) iris_vline # Display data for lines # Species lines colors sizes # 1 setosa 1.0 2 5 # 2 versicolor 2.2 3 2 # 3 virginica NA NA NA |
my_plot + # Add different lines to facet plot geom_vline(data = iris_vline, aes(xintercept = lines), color = iris_vline$colors, size = iris_vline$sizes) |
Further Resources
Please find some related R tutorials on topics such as text elements, graphics in R, plot legends, and colors in the following list.