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.

r graph figure 1 ggplot2 warning message r use data is discouraged

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()

r graph figure 2 ggplot2 warning message r use data is discouraged

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