ggplot2 Warning Message in R – Use of Data is discouraged (2 Examples)
In this tutorial, I’ll explain how to deal with the ggplot2 warning message “Use of data$column is discouraged. Use column instead” in the R programming language.
Preparing the Examples
data(iris) # Loading data to R head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa |
install.packages("ggplot2") # Install ggplot2 package library("ggplot2") # Load ggplot2 package |
Example 1: Replicating the Warning – Use of iris$Petal.Length is discouraged
ggplot(iris, # Warning message due to iris$ aes(x = iris$Petal.Length, y = iris$Petal.Width)) + geom_line() # Warning messages: # 1: Use of `iris$Petal.Length` is discouraged. Use `Petal.Length` instead. # 2: Use of `iris$Petal.Width` is discouraged. Use `Petal.Width` instead. |
Example 2: Debugging the Warning – Use of iris$Petal.Length is discouraged
ggplot(iris, # No warning message aes(x = Petal.Length, y = Petal.Width)) + geom_line() |
