Manually Sort Panels of Facet Plot – R ggplot2 Package (Example Code)

In this R tutorial you’ll learn how to reorder facets in a ggplot2 facet plot.

Preparing the Example

data(iris)                                                         # Load iris
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, aes(Petal.Length, Petal.Width)) +          # Default ordering
  geom_point() +
  facet_grid(.~Species)
my_plot                                                            # Drawing ggplot2 facet plot

r graph figure 1 manually sort panels facet   r ggplot2 package

Example: Manually Order Facet Plot with relevel() Function

iris_new <- iris                                                   # Replicating iris data set
iris_new$Species <- relevel(iris_new$Species,                      # Reordering factor levels
                            "virginica", "setosa", "versicolor")
my_plot_new <- ggplot(iris_new, aes(Petal.Length, Petal.Width)) +  # Recreate ggplot2 facet plot
  geom_point() +
  facet_grid(.~Species)
my_plot_new                                                        # Create updated plot

r graph figure 2 manually sort panels facet   r ggplot2 package

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