na_if R Function of dplyr Package (2 Examples) | Convert Value to NA
In this article you’ll learn how to replace NA values with the na_if function of the dplyr add-on package in the R programming language.
The article will contain this:
- Example 1: Apply na_if Function to Vector
- Example 2: Apply na_if Function to Data Frame or Tibble
- Video, Further Resources & Summary
Let’s jump right to the examples.
Example 1: Apply na_if Function to Vector
As a first step, we need to install and load the dplyr package to R:
install.packages("dplyr") # Install dplyr add-on package library("dplyr") # Load dplyr add-on package
Furthermore, we have to create an example vector, to which we can apply the na_if function later on:
x <- 1:10 # Create example vector x # Print example vector # 1 2 3 4 5 6 7 8 9 10
Now, we can use the na_if function to replace a certain value of our example vector with NA:
na_if(x, 5) # Apply na_if to vector # 1 2 3 4 NA 6 7 8 9 10
As you can see based on the previous R code and the output of the RStudio console, we replaced the value 5 of our vector with NA.
Example 2: Apply na_if Function to Data Frame or Tibble
We can also use the na_if command to replace certain values of a data frame or tibble with NA. Let’s create an example data frame first:
data <- data.frame(x1 = 1:5, # Create example data x2 = 5:9) data # Print example data # x1 x2 # 1 1 5 # 2 2 6 # 3 3 7 # 4 4 8 # 5 5 9
Our data frame contains five rows and two numeric variables. Now, we can apply the na_if function to this data frame as shown below:
na_if(data, 5) # Apply na_if to data frame # x1 x2 # 1 1 NA # 2 2 6 # 3 3 7 # 4 4 8 # 5 NA 9
The previous R syntax replaced each 5 in our data set with NA.
Video, Further Resources & Summary
Have a look at the following video that I have published on my YouTube channel. I’m explaining further functions of the dplyr package in the video:
Furthermore, I can recommend to have a look at some of the other articles of my website. You can find some tutorials here:
- Replace NA with 0
- Replace NA with Last Observed Value
- str_replace_na Function in R
- Introduction to dplyr
- R Functions List (+ Examples)
- The R Programming Language
In summary: In this tutorial you learned how to convert values to NA with the dplyr package in the R programming language. If you have further questions or comments, please let me know in the comments below.