R Difference Between ggplot2’s facet_wrap & facet_grid Explained (2 Examples)

data(iris)                                   # Loading iris data set
iris_new <- iris                             # Modify iris
iris_new$subgroup <- rep(letters[1:2], each = 75)
head(iris_new)                               # Head of example data
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species subgroup
# 1          5.1         3.5          1.4         0.2  setosa        a
# 2          4.9         3.0          1.4         0.2  setosa        a
# 3          4.7         3.2          1.3         0.2  setosa        a
# 4          4.6         3.1          1.5         0.2  setosa        a
# 5          5.0         3.6          1.4         0.2  setosa        a
# 6          5.4         3.9          1.7         0.4  setosa        a

data(iris) # Loading iris data set iris_new <- iris # Modify iris iris_new$subgroup <- rep(letters[1:2], each = 75) head(iris_new) # Head of example data # Sepal.Length Sepal.Width Petal.Length Petal.Width Species subgroup # 1 5.1 3.5 1.4 0.2 setosa a # 2 4.9 3.0 1.4 0.2 setosa a # 3 4.7 3.2 1.3 0.2 setosa a # 4 4.6 3.1 1.5 0.2 setosa a # 5 5.0 3.6 1.4 0.2 setosa a # 6 5.4 3.9 1.7 0.4 setosa a

install.packages("ggplot2")                  # Install ggplot2 package
library("ggplot2")                           # Load ggplot2

install.packages("ggplot2") # Install ggplot2 package library("ggplot2") # Load ggplot2

my_plot <- ggplot(iris_new,
                  aes(x = Petal.Length,
                      y = Petal.Width)) +    # Create plot without facets
  geom_line()

my_plot <- ggplot(iris_new, aes(x = Petal.Length, y = Petal.Width)) + # Create plot without facets geom_line()

my_plot +                                    # facet_wrap
  facet_wrap(Species ~ subgroup)

my_plot + # facet_wrap facet_wrap(Species ~ subgroup)

my_plot +                                    # facet_grid
  facet_grid(Species ~ subgroup)

my_plot + # facet_grid facet_grid(Species ~ subgroup)