R Extract Single Variable from Data & Keep data.frame Class (Example Code)
In this tutorial, I’ll explain how to extract one variable as data frame in the R programming language.
Creating Example Data
data(iris) # Example data 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 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
Example: Select Only One Column & Keep data.frame Class
head(iris[3]) # Extract single column data.frame # Petal.Length # 1 1.4 # 2 1.4 # 3 1.3 # 4 1.5 # 5 1.4 # 6 1.7 |
head(iris[3]) # Extract single column data.frame # Petal.Length # 1 1.4 # 2 1.4 # 3 1.3 # 4 1.5 # 5 1.4 # 6 1.7
Related Articles
Have a look at the following list of R programming language tutorials. They discuss topics such as character strings, indices, and extracting data: