Calculate the Sum of Matrix or Array columns in R Programming – colSums() Function

• Last Updated : 03 Jun, 2020

colSums() function in R Language is used to compute the sums of matrix or array columns.

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

Parameters:
x: matrix or array
dims: this is integer value whose dimensions are regarded as ‘columns’ to sum over. It is over dimensions 1:dims.

Example 1:

 # R program to illustrate# colSums function  # Initializing a matrix with 3 # rows and 3 columnsx <- matrix(rep(1:9), 3, 3)  # Getting the matrix representationx  # Calling the colSums() functioncolSums(x)

Output:

[, 1] [, 2] [, 3]
[1, ]    1    4    7
[2, ]    2    5    8
[3, ]    3    6    9

[1]  6 15 24

Example 2:

 # R program to illustrate# colSums function  # Initializing a 3D arrayx <- array(1:12, c(2, 3, 3))  # Getting the array representationx  # Calling the colSums() functioncolSums(x, dims = 1)colSums(x, dims = 2)

Output:

,, 1

[, 1] [, 2] [, 3]
[1, ]    1    3    5
[2, ]    2    4    6,, 2

[, 1] [, 2] [, 3]
[1, ]    7    9   11
[2, ]    8   10   12,, 3

[, 1] [, 2] [, 3]
[1, ]    1    3    5
[2, ]    2    4    6

[, 1] [, 2] [, 3]
[1, ]    3   15    3
[2, ]    7   19    7
[3, ]   11   23   11

[1] 21 57 21
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