Convert Data Frame Row to Vector in R (Example)

 

In this article, I’ll illustrate how to extract a row from a data frame and convert it to a vector in the R programming language.

Table of contents:

So now the part you have been waiting for – the programming part:

 

Creation of Example Data

First, we have to create some example data in R:

data <- data.frame(x1 = 1:5,      # Create example data
                   x2 = 2:6,
                   x3 = 3:7)
data                              # Print example data
#   x1 x2 x3
# 1  1  2  3
# 2  2  3  4
# 3  3  4  5
# 4  4  5  6
# 5  5  6  7

Our data frame consists of five rows and three columns. Note that all columns have the same data type (i.e. numeric).

 

Example: Convert Row to Numeric Vector

If we want to extract a particular row of our data frame, we can specify the row index of this row within square brackets:

data[3, ]                         # Extract row of data frame
#   x1 x2 x3
# 3  3  4  5

As you can see based on the previous output of the RStudio console, we have just extracted a single row from our data matrix. However, this output is still a one-row data frame.

In order to convert this one-row data frame to a vector, we can use the as.numeric function as follows:

as.numeric(data[3, ])             # Convert row to vector
# 3 4 5

The final output is a numeric vector consisting of the values of row three.

 

Video & Further Resources

I have recently published a video on my YouTube channel, which illustrates the topics of this page. 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.

 

In addition, I can recommend to read the other articles of https://statisticsglobe.com/. You can find a selection of tutorials below:

 

In summary: You learned in this article how to convert a row of a data frame to a vector (or array) in R. In case you have additional questions, let me know in the comments.

 

Subscribe to my free statistics 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Your email address will not be published.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