Select Subset of Data Table Columns in R (Example)

 

In this article, I’ll illustrate how to extract certain variables from a data.table in R.

Table of contents:

Let’s take a look at some R codes in action:

 

Example Data & Add-On Packages

To be able to use the functions of the data.table package, we have to install and load data.table first:

install.packages("data.table")                            # Install data.table package
library("data.table")                                     # Load data.table

We use the following data.table as basement for this R tutorial:

dat_tab <- data.table(matrix(1:12, ncol = 4))             # Create example data table
dat_tab                                                   # Print example data table

 

table 1 data table select subset data table columns r

 

As you can see based on Table 1, our exemplifying data is a data.table containing three rows and four variables.

 

Example: Remove Columns from Data Table Using with = FALSE

This example illustrates how to drop a specific set of variables from our data.table.

For this, we have to specify a vector of column names that we want to retain. Furthermore, we have to set the with argument to be equal to FALSE:

dat_tab_new <- dat_tab[ , ! c("V1", "V3"), with = FALSE]  # Remove columns
dat_tab_new                                               # Print updated data table

 

table 2 data table select subset data table columns r

 

In Table 2 you can see that we have constructed a data.table containing only two columns by running the previous code.

 

Video, Further Resources & Summary

Some time ago I have published a video on my YouTube channel, which illustrates the R programming codes of this tutorial. You can find the video below.

 

Please accept YouTube cookies to play this video. By accepting you will be accessing content from YouTube, a service provided by an external third party.

YouTube Content Consent Button Thumbnail

YouTube privacy policy

If you accept this notice, your choice will be saved and the page will refresh.

 

Also, you might have a look at some of the related R articles of this website:

 

In summary: In this article you have learned how to retain particular columns of a data.table in the R programming language. If you have additional questions, don’t hesitate to let me know in the comments.

 

Subscribe to the Statistics Globe Newsletter

Get regular updates on the latest tutorials, offers & news at Statistics Globe.
I hate spam & you may opt out anytime: Privacy Policy.


Leave a Reply

Your email address will not be published. Required fields are marked *

Fill out this field
Fill out this field
Please enter a valid email address.

Menu
Top