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 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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