ggplot2 R Warning – geom_path Each Group One Observation (2 Examples)

data(iris)                                  # Loading example data in R
iris_new <- iris[c(1, 51, 101), c(1, 5)]    # Modify example data
iris_new                                    # Show example data
#     Sepal.Length    Species
# 1            5.1     setosa
# 51           7.0 versicolor
# 101          6.3  virginica

data(iris) # Loading example data in R iris_new <- iris[c(1, 51, 101), c(1, 5)] # Modify example data iris_new # Show example data # Sepal.Length Species # 1 5.1 setosa # 51 7.0 versicolor # 101 6.3 virginica

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

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

ggplot(iris_new,                            # Reproducing warning message
       aes(x = Species,
           y = Sepal.Length)) +
  geom_point() +
  geom_line()
# geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

ggplot(iris_new, # Reproducing warning message aes(x = Species, y = Sepal.Length)) + geom_point() + geom_line() # geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

ggplot(iris_new,                            # Properly draw ggplot2 line chart
       aes(x = Species,
           y = Sepal.Length,
           group = 1)) +                      # This line of code is new!
  geom_point() +
  geom_line()

ggplot(iris_new, # Properly draw ggplot2 line chart aes(x = Species, y = Sepal.Length, group = 1)) + # This line of code is new! geom_point() + geom_line()