ggplot2 Error in R: geom_point requires the following missing aesthetics: x or y (2 Examples)

data(iris)                       # Example data for illustration of error
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

data(iris) # Example data for illustration of error 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

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

ggplot(iris,                     # Second variable is not specified
       aes(x = Sepal.Length)) +
  geom_point()
# Error: geom_point requires the following missing aesthetics: y
# Run `rlang::last_error()` to see where the error occurred.

ggplot(iris, # Second variable is not specified aes(x = Sepal.Length)) + geom_point() # Error: geom_point requires the following missing aesthetics: y # Run `rlang::last_error()` to see where the error occurred.

ggplot(iris,                     # Second variable is properly specified
       aes(x = Sepal.Length,
           y = Sepal.Width)) +
  geom_point()

ggplot(iris, # Second variable is properly specified aes(x = Sepal.Length, y = Sepal.Width)) + geom_point()