How to Add a Prefix to Variable Names in R (Example Code)
This article explains how to insert a prefix in front of the column names of a data frame in R programming.
Example Data
data(iris) # Iris data set as 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) # Iris data set as 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: Adding Prefix in Front of Column Names of Data Frame
iris_pref <- iris # Duplicate data colnames(iris_pref) <- paste0("PREF.", colnames(iris_pref)) # Add prefix head(iris_pref) # Print updated data # PREF.Sepal.Length PREF.Sepal.Width PREF.Petal.Length PREF.Petal.Width PREF.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 |
iris_pref <- iris # Duplicate data colnames(iris_pref) <- paste0("PREF.", colnames(iris_pref)) # Add prefix head(iris_pref) # Print updated data # PREF.Sepal.Length PREF.Sepal.Width PREF.Petal.Length PREF.Petal.Width PREF.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
Related Tutorials
Have a look at the following R programming language tutorials. They discuss topics such as matrices, merging, and extracting data: