In this guide, we will share with you what the lead() function does in R and how to use this function. The lead in R helps you set the NA values at the end of the R object. Follow us to learn how to perform the lead() function with the explanation below.
What does lead() do in R?
The lead() function is built in the ‘dplyr’ package and it is used to set the NA values with the specified number of elements from the ending of the R object like the vector, the data frame, … You can also set the NA values with the specified number of elements from the beginning of an object by the lag() function in my previous tutorial. Now, take a look at the syntax of the lead() function.
Syntax:
dplyr :: lead(data, length)
Parameters:
- data: The R object.
- length: The number of elements you want to set NA values from the ending of the object.
After learning what the lead in R does and the syntax of this function, we will show you how to perform it in the next title below.
How to use the lead in R?
To use the lead in R, you must install the ‘dplyr’ package first by the following command.
install.packages('dplyr')Lead function with the vector
Using the lead() function to set the NA values at the end of the vector.
Look at the example below.
# Create the vector vec <- c(5, 3, 4, 6, 8, 3, 2) # Set a NA value at the end of the vector dplyr::lead(vec)
Output
[1] 3 4 6 8 3 2 NASet multiple NA values with the lead function in R
You can set multiple NA values at the end of the vector with the lead function by assigning a value to the ‘length’ parameter.
Look at the example below.
# Create the vector vec <- c(5, 3, 4, 6, 8, 3, 2) # Set 3 NA values at the end of the vector dplyr::lead(vec, 3)
Output
[1] 6 8 3 2 NA NA NALead function with the data frame
You can also use the lead function with the data frame to set the NA values at the end of all columns.
Look at the example below.
# Create the data frame.
df <- data.frame(
season = c(2010, 2011, 2012, 2013, 2014),
champion = c("RMA", "BAR", "RMA", "BAY", "RMA")
)
dplyr::lead(df)Output
season champion
1 2011 BAR
2 2012 RMA
3 2013 BAY
4 2014 RMA
5 NA <NA>Set multiple NA values in the data frame
Like the vector, you can also set multiple NA values in the data frame.
Look at the example below.
# Create the data frame
df <- data.frame(
season = c(2010, 2011, 2012, 2013, 2014),
champion = c("RMA", "BAR", "RMA", "BAY", "RMA")
)
# Set 2 NA values at the end of all columns
dplyr::lead(df, 2)Output
season champion
1 2012 RMA
2 2013 BAY
3 2014 RMA
4 NA <NA>
5 NA <NA>Summary
We have shown you the definition, the syntax, and how to perform the lead in R. The lead() function in R is used to set the NA values at the end of the R object. We hope this tutorial is helpful to you. Thanks!
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- ordered in R: How to create or convert the ordered factor in R
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My name is Thomas Valen. As a software developer, I am well-versed in programming languages. Don’t worry if you’re having trouble with the C, C++, Java, Python, JavaScript, or R programming languages. I’m here to assist you!
Name of the university: PTIT
Major: IT
Programming Languages: C, C++, Java, Python, JavaScript, R
