Refer to Last Variable of Data Frame in R (Example Code)
In this article, I’ll show how to extract the very last variable of a data frame in the R programming language.
Creation of Example Data
data(iris) # Example data head(iris) # Head of example data in RStudio # 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 head(iris) # Head of example data in RStudio # 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
Example: Select Last Column Using ncol() Function
iris_last <- iris[ , ncol(iris)] # Extract column head(iris_last) # Display head of last column # [1] setosa setosa setosa setosa setosa setosa # Levels: setosa versicolor virginica |
iris_last <- iris[ , ncol(iris)] # Extract column head(iris_last) # Display head of last column # [1] setosa setosa setosa setosa setosa setosa # Levels: setosa versicolor virginica
Further Resources & Related Articles
You may find some related R programming tutorials in the following list: