List All Levels of Factor Column in R (Example Code)

On this page you’ll learn how to return all factor levels of a vector or data frame in the R programming language.

Creating Example Data

data(iris)                  # Load iris data set
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example: Return Factor Levels of Column Vector

levels(iris$Species)        # Print factor levels of factor variable
# [1] "setosa"     "versicolor" "virginica"

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