How to Delete Several Variables from data.table in R Programming (Example Code)
This article shows how to delete several data.table variables in the R programming language.
Preparing the Example
install.packages("data.table") # Install & load data.table package library("data.table") |
install.packages("data.table") # Install & load data.table package library("data.table")
data(iris) # Load data setDT(iris) # Convert iris to data.table head(iris) # First rows # 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) # Load data setDT(iris) # Convert iris to data.table head(iris) # First rows # 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: Delete Multiple data.table Columns
iris[ ,`:=`(Sepal.Width = NULL, # Remove columns Petal.Width = NULL, Species = NULL)] |
iris[ ,`:=`(Sepal.Width = NULL, # Remove columns Petal.Width = NULL, Species = NULL)]
head(iris) # First rows of new data.table # Sepal.Length Petal.Length # 1: 5.1 1.4 # 2: 4.9 1.4 # 3: 4.7 1.3 # 4: 4.6 1.5 # 5: 5.0 1.4 # 6: 5.4 1.7 |
head(iris) # First rows of new data.table # Sepal.Length Petal.Length # 1: 5.1 1.4 # 2: 4.9 1.4 # 3: 4.7 1.3 # 4: 4.6 1.5 # 5: 5.0 1.4 # 6: 5.4 1.7