Lookup Table in R (Example)

 

In this R programming tutorial you’ll learn how to make a lookup table.

Table of contents:

It’s time to dive into the exemplifying R code:

 

Creation of Exemplifying Data

The first step is to create some data that we can use in the examples later on:

data <- data.frame(x1 = 1:9,               # Create example data
                   x2 = letters[1:3])
data                                       # Print example data

 

table 1 data frame lookup table

 

Have a look at the table that has been returned after running the previous R programming code. It shows that our example data is made up of nine rows and two columns. The variable x1 is an integer and the variable x2 is a character.

Next, we have to create an exemplifying vector object based on which we can look up certain values in our data frame:

vec <- letters[1:2]                        # Create example vector
vec                                        # Print example vector
# [1] "a" "b"

Our example vector contains the character letters a and b.

 

Example: Create Lookup Table Using %in% Operator

This example demonstrates how to create a lookup table, i.e. a data frame subset based on a logical condition.

For this, we can use the %in% operator as shown below:

data_lookup <- data[data$x2 %in% vec, ]    # Extract matching rows
data_lookup                                # Print lookup table

 

table 2 data frame lookup table

 

Table 2 shows the output of the previous code – A subset of our data set.

 

Video & Further Resources

Would you like to learn more about the creation of a lookup table? Then I recommend having a look at the following video tutorial on my YouTube channel. In the video, I explain the R programming syntax of this article in RStudio.

 

The YouTube video will be added soon.

 

Note that there are many different ways to create a lookup table. In this case, we have extracted a data frame subset using a logical condition based on the values in a vector. You may modify the given code based on your specific needs.

You could have a look at the related articles on my website. Some articles are shown below:

 

In summary: At this point you should have learned how to create a lookup table in R. In case you have any further questions, don’t hesitate to let me know in the comments below.

 

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.

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

Menu
Top