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 matrix
dims: 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 Matrixprint(x) # Calling the rowSums() functionrowSums(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 arrayx <- array(1:8, c(2, 2, 2)) # Printing the arrayprint(x) # Calling the rowSums() functionrowSums(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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