Get the Number of Levels of a Factor in R Programming - nlevels() Function

Get or Set Levels of a Factor in R Programming – levels() Function

Last Updated : 16 Jun, 2020

levels() function in R Language is used to get or set the levels of a factor.

Syntax: levels(x)

Parameters:
x: Factor Object

Example 1:

# R program to get levels of a factor 
  
# Creating a factor 
gender <- factor(c("female", "male", "male", "female"));  
gender 
  
# Calling levels() function 
# to get the levels 
levels(gender) 

Output:

[1] female male   male   female
Levels: female male
[1] "female" "male"

Example 2:

# R program to set levels of a factor 
  
# Creating a factor 
gender <- factor(c("female", "male", "male", "female"));  
gender 
  
# Calling levels() function 
# to set the levels 
levels(gender) <- c("abc", "def") 
gender 

Output:

[1] female male   male   female
Levels: female male
[1] abc def def abc
Levels: abc def

Get the Number of Levels of a Factor in R Programming - nlevels() Function

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