# How to find the sum of all array elements in R?

R ProgrammingServer Side ProgrammingProgramming

To find the sum of all array elements in R, we can use Reduce function with plus sign. For Example, if we have an array called ARRAY and we want to find the sum of all values in this array then we can use the command Reduce("+",ARRAY).

Check out the below Examples to understand how it works.

## Example 1

To find the sum of all array elements in R use the snippet given below −

Array1<-array(1:100,c(5,4,5))
Array1
, , 1

If you execute the above given snippet, it generates the following Output −

    [,1] [,2] [,3] [,4]
[1,] 1    6    11   16
[2,] 2    7    12   17
[3,] 3    8    13   18
[4,] 4    9    14   19
[5,] 5   10    15   20

To find the sum of all array elements in R use the snippet given below −

Array1<-array(1:100,c(5,4,5))
Array1
, , 2

If you execute the above given snippet, it generates the following Output −

    [,1] [,2] [,3] [,4]
[1,] 21   26   31   36
[2,] 22   27   32   37
[3,] 23   28   33   38
[4,] 24   29   34   39
[5,] 25   30   35   40

To find the sum of all array elements in R use the snippet given below −

Array1<-array(1:100,c(5,4,5))
Array1
, , 3

If you execute the above given snippet, it generates the following Output −

   [,1] [,2] [,3] [,4]
[1,] 41  46   51   56
[2,] 42  47   52   57
[3,] 43  48   53   58
[4,] 44  49   54   59
[5,] 45  50   55   60

To find the sum of all array elements in R use the snippet given below −

Array1<-array(1:100,c(5,4,5))
Array1
, , 4

If you execute the above given snippet, it generates the following Output −

   [,1] [,2] [,3] [,4]
[1,] 61  66   71   76
[2,] 62  67   72   77
[3,] 63  68   73   78
[4,] 64  69   74   79
[5,] 65  70   75   80

To find the sum of all array elements in R use the snippet given below −

Array1<-array(1:100,c(5,4,5))
Array1
, , 5

If you execute the above given snippet, it generates the following Output −

   [,1] [,2] [,3] [,4]
[1,] 81  86   91   96
[2,] 82  87   92   97
[3,] 83  88   93   98
[4,] 84  89   94   99
[5,] 85  90   95  100

To find the sum of all elements in Array1 on the above created data frame, add the following code to the above snippet −

Array1<-array(1:100,c(5,4,5))
Reduce("+",Array1)

## Output

If you execute all the above given snippets as a single program, it generates the following Output −

 5050


## Example 2

To find the sum of all array elements in R use the snippet given below −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Array2
, , 1

If you execute the above given snippet, it generates the following Output −

     [,1] [,2] [,3] [,4] [,5]
[1,]  0.4 -0.5  0.8  0.0  2.0
[2,] -0.5 -1.2  0.8 -0.1  1.6
[3,] -1.8 -1.2 -0.1  2.4 -1.5
[4,]  0.9 -0.8 -0.8  0.7 -0.4
[5,]  1.5 -0.7  1.2  1.3 -0.5

To find the sum of all array elements in R use the snippet given below −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Array2
, , 2

If you execute the above given snippet, it generates the following Output −

     [,1] [,2] [,3] [,4] [,5]
[1,]  0.9  0.9 -1.1  0.3 -1.2
[2,] -0.9  0.6  0.3 -2.5 -0.4
[3,]  0.2  0.9 -0.6  0.9 -0.6
[4,] -1.3 -0.1 -0.7 -0.9 -0.5
[5,]  0.5  1.5 -0.2  0.5 -0.3

To find the sum of all array elements in R use the snippet given below −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Array2
, , 3

If you execute the above given snippet, it generates the following Output −

     [,1] [,2] [,3] [,4] [,5]
[1,] -1.0 -0.6 -0.9 -1.8 -0.1
[2,]  1.0  0.0 -0.5 -1.0 -1.1
[3,] -0.7  2.0  0.6 -0.2  0.1
[4,]  1.2 -1.7  1.4  0.5 -1.9
[5,] -0.2  0.3 -2.5  1.9  0.0

To find the sum of all array elements in R use the snippet given below −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Array2
, , 4

If you execute the above given snippet, it generates the following Output −

     [,1] [,2] [,3] [,4] [,5]
[1,] -0.4 -0.1  0.7  0.3 -1.1
[2,]  0.0 -0.2  0.2  1.0  0.4
[3,]  0.5 -1.2 -0.1 -0.2 -0.2
[4,]  1.3  1.3  0.5  0.4  2.1
[5,]  0.8  0.2 -0.5 -0.1 -0.6

To find the sum of all array elements in R use the snippet given below −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Array2
, , 5

If you execute the above given snippet, it generates the following Output −

     [,1] [,2] [,3] [,4] [,5]
[1,]  0.1  0.3 -1.8  0.9 -0.6
[2,]  0.2  1.9  0.4 -1.1  2.1
[3,]  2.0 -0.4  0.0  3.1 -2.2
[4,] -0.5 -0.4 -0.8 -0.2 -2.2
[5,] -0.7 -0.3  0.3 -1.9  0.0

To find the sum of all elements in Array2 on the above created data frame, add the following code to the above snippet −

Array2<-array(round(rnorm(125),1),c(5,5,5))
Reduce("+",Array2)

## Output

If you execute all the above given snippets as a single program, it generates the following Output −

 -2.3