Compute the Sum of Rows of a Matrix or Array in R Programming – rowSums Function

** rowSums()** function in R Language is used to compute the sum of rows of a matrix or an array.

Syntax:rowSums(x, na.rm = FALSE, dims = 1)

Parameters:x:array or matrixdims:Integer: Dimensions are regarded as ‘rows’ to sum over. It is over dimensions dims+1, ….

**Example 1:**

`# R program to illustrate` `# rowSums() function` ` ` `# Initializing a matrix ` `x <` `-` `matrix(rep(` `2` `:` `10` `), ` `3` `, ` `3` `)` ` ` `# Printing Matrix` `print` `(x)` ` ` `# Calling the rowSums() function` `rowSums(x)` |

**Output:**

[, 1] [, 2] [, 3] [1, ] 2 5 8 [2, ] 3 6 9 [3, ] 4 7 10 [1] 15 18 21

**Example 2:**

`# R program to illustrate` `# rowSums function` ` ` `# Initializing a 3D array` `x <` `-` `array(` `1` `:` `8` `, c(` `2` `, ` `2` `, ` `2` `))` ` ` `# Printing the array` `print` `(x)` ` ` `# Calling the rowSums() function` `rowSums(x, dims ` `=` `1` `)` |

**Output:**

,, 1 [, 1] [, 2] [1, ] 1 3 [2, ] 2 4,, 2 [, 1] [, 2] [1, ] 5 7 [2, ] 6 8 [1] 16 20

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