How to Apply the split() & unsplit() Functions in R (2 Examples)

In this tutorial, I’ll illustrate how to apply the split and unsplit functions in the R programming language.

Example Data

data(iris)                                            # Load iris data
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 1: Splitting Data Frame Column Using split Function

iris_split <- split(iris$Sepal.Length, iris$Species)  # Applying split() in R
iris_split                                            # Printing output of split function
# $setosa
# [1] 5.1 4.9 4.7 4.6 5.0 5.4 4.6 5.0 4.4 4.9 5.4 4.8 ...
# 
# $versicolor
# [1] 7.0 6.4 6.9 5.5 6.5 5.7 6.3 4.9 6.6 5.2 5.0 5.9 ...
# 
# $virginica
# [1] 6.3 5.8 7.1 6.3 6.5 7.6 4.9 7.3 6.7 7.2 6.5 6.4 ...

Example 2: Unsplitting Data Frame Column Using unsplit Function

iris_unsplit <- unsplit(iris_split, iris$Species)     # Applying unsplit() in R
iris_unsplit                                          # Printing output of unsplit function
# [1] 5.1 4.9 4.7 4.6 5.0 5.4 4.6 5.0 4.4 4.9 5.4 4.8 4.8 4.3 5.8 5.7 5.4 5.1 5.7 5.1 ...
iris_unsplit == iris$Sepal.Length                     # Compare unsplit output with original data column
# [1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE ...

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