Split Vector into Chunks in R (2 Examples)

 

On this page, I’ll show how to divide a vector or array into groups in R.

Table of contents:

Let’s dig in:

 

Creating Example Data

The data below is used as basement for this R programming language tutorial:

my_vec <- 1:100           # Create example vector
my_vec                    # Print first values of example vector
# [1]   1   2   3   4   5   6   7   8   9  10  11  12 ...

Have a look at the previous output of the RStudio console. It shows that our example data is a vector consisting of 100 numeric values that are ranging from 1 to 100.

 

Example 1: Split Vector into Chunks Given the Length of Each Chunk

In Example 1, I’ll show how to divide a vector into subgroups when we know the number of elements each group should contain.

First, we have to specify the number of elements in each group (i.e. 20):

chunk_length <- 20        # Define number of elements in chunks

Now, we can use the split, ceiling, and seq_along functions to divide our vector into chunks:

split(my_vec,             # Applying split() function
      ceiling(seq_along(my_vec) / chunk_length))
# $`1`
# [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
# 
# $`2`
# [1] 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
# 
# $`3`
# [1] 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
# 
# $`4`
# [1] 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
# 
# $`5`
# [1]  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99 100

The output is a list consisting of five list elements. Each list element contains 20 values of our input vector.

 

Example 2: Split Vector into Chunks Given the Number of Chunks

This example illustrates how to divide a vector into subgroups when we know the number of subgroups that we want to create.

First, we have to set a number of subgroups we want to create (i.e. seven):

chunk_number <- 7         # Define number of chunks

Now, we can apply the split, cut, and seq_along functions to create our seven chunks:

split(my_vec,             # Applying split() function
      cut(seq_along(my_vec),
          chunk_number,
          labels = FALSE))
# $`1`
# [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
# 
# $`2`
# [1] 16 17 18 19 20 21 22 23 24 25 26 27 28 29
# 
# $`3`
# [1] 30 31 32 33 34 35 36 37 38 39 40 41 42 43
# 
# $`4`
# [1] 44 45 46 47 48 49 50 51 52 53 54 55 56 57
# 
# $`5`
# [1] 58 59 60 61 62 63 64 65 66 67 68 69 70 71
# 
# $`6`
# [1] 72 73 74 75 76 77 78 79 80 81 82 83 84 85
# 
# $`7`
# [1]  86  87  88  89  90  91  92  93  94  95  96  97  98  99 100

The output is a list with seven list elements.

 

Video & Further Resources

I have recently released a video on my YouTube channel, which illustrates the R programming syntax of this tutorial. You can find the video below:

 

The YouTube video will be added soon.

 

In addition, you might have a look at some of the related tutorials of www.statisticsglobe.com:

 

You learned in this tutorial how to split vectors into different parts in R. Let me know in the comments section, if you have any further questions.

 

Subscribe to my free statistics newsletter

Get regular updates on the latest tutorials, offers & news at Statistics Globe.
I hate spam & you may opt out anytime: Privacy Policy.


Leave a Reply

Your email address will not be published. Required fields are marked *

Fill out this field
Fill out this field
Please enter a valid email address.

Menu
Top