# Sum a List of Matrices in R (Example)

In this article, I’ll show how to calculate the sum of all matrix objects in a list in the R programming language.

The tutorial contains these contents:

Let’s dive into it!

## Creation of Example Data

Have a look at the following example data:

```my_list <- list(mat1 = matrix(1:16, ncol = 4), # Create example list of matrices mat2 = matrix(11:26, ncol = 4), mat3 = matrix(101:116, ncol = 4)) my_list # Print example list of matrices # \$mat1 # [,1] [,2] [,3] [,4] # [1,] 1 5 9 13 # [2,] 2 6 10 14 # [3,] 3 7 11 15 # [4,] 4 8 12 16 # # \$mat2 # [,1] [,2] [,3] [,4] # [1,] 11 15 19 23 # [2,] 12 16 20 24 # [3,] 13 17 21 25 # [4,] 14 18 22 26 # # \$mat3 # [,1] [,2] [,3] [,4] # [1,] 101 105 109 113 # [2,] 102 106 110 114 # [3,] 103 107 111 115 # [4,] 104 108 112 116```

The previous RStudio console output shows that our example data is a list object containing three different matrices.

## Example: Get Sum of All Matrices in List Using Reduce() Function

The following R code explains how to add the values in multiple matrices in a list.

For this task, we can apply the Reduce function as shown below:

```list_sum <- Reduce("+", my_list) # Calculate sum of matrices list_sum # Print sum of matrices``` Have a look at the previous table: It shows the sum of the three matrices in our example list stored in a new matrix object called list_sum.

## Video & Further Resources

In case you need further information on the R programming codes of this tutorial, I recommend having a look at the following video on my YouTube channel. In the video, I’m explaining the topics of this tutorial.

The YouTube video will be added soon.

Furthermore, you might want to read the other articles on this website.

To summarize: You have learned in this article how to compute the sum of all matrices in a list in the R programming language. If you have additional questions, please let me know in the comments section.

Subscribe to the Statistics Globe Newsletter

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