# Divide data into groups in R

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Divide data into groups in R, we will learn how to use the `split`

and `unsplit`

functions in R to divide and reassemble vectors into groups.

These functions are useful when you need to separate a large dataset into smaller groups based on specific criteria and then reassemble the data back into a single vector.

**Definitions and Basic R Syntaxes**

The `split`

function divides data into groups, while the `unsplit`

function reverses the output of the `split`

function. The basic R syntaxes for these functions are:

split(values, groups) unsplit(split_values, groups)

**Creation of Example Data**

We will create an example vector and a grouping vector to demonstrate the use of the `split`

and `unsplit`

functions.

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vec <- 1:10 vec # 1 2 3 4 5 6 7 8 9 10 groups <- c(rep("A", 3), rep("B", 5), rep("C", 2)) groups # "A" "A" "A" "B" "B" "B" "B" "B" "C" "C"

**Example 1: Using split() Function in R**

In this example, we will use the `split`

function to divide our example data into three groups based on the grouping vector.

my_split <- split(vec, groups) my_split # $A # [1] 1 2 3 # # $B # [1] 4 5 6 7 8 # # $C # [1] 9 10

As you can see, the `split`

function created a list called `my_split`

, which contains three list elements, each representing a group.

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**Example 2: Using unsplit() Function in R**

In this example, we will use the `unsplit`

function to reassemble the data back into a single vector.

my_unsplit <- unsplit(my_split, groups) my_unsplit # [1] 1 2 3 4 5 6 7 8 9 10

As you can see, the `unsplit`

function successfully reassembled the data back into a single vector.

**Conclusion**

In this tutorial, we have learned how to use the `split`

and `unsplit`

functions in R to divide and reassemble vectors into groups.

We have demonstrated how to use these functions to separate a large dataset into smaller groups based on specific criteria and then reassemble the data back into a single vector.

With these functions, you can easily manipulate and analyze large datasets in R.

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