# 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)

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

# 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

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