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

Calculate the Mean of each Column of a Matrix or Array in R Programming - colMeans() Function

Last Updated : 03 Jun, 2020

colMeans() function in R Language is used to compute the mean of each column of a matrix or array.

Syntax: colMeans(x, dims = 1) Parameters: x: array of two or more dimensions, containing numeric, complex, integer or logical values, or a numeric data frame dims: integer value, which dimensions are regarded as ‘columns’ to sum over. It is over dimensions 1:dims.

Example 1:

Python3

# R program to illustrate
# colMeans function

# Initializing a matrix with
# 3 rows and 3 columns
x <- matrix(rep(1:9), 3, 3)

# Getting matrix representation
x

# Calling the colMeans() function
colMeans(x)

Output:

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

[1] 2 5 8

Example 2:

Python3

# R program to illustrate
# colMeans function

# Initializing a 3D array
x <- array(1:12, c(2, 3, 3))

# Getting the array representation
x

# Calling the colMeans() function

# for dims = 1, x[, 1, 1], x[, 2, 1], x[, 3, 1],
# x[, 1, 2] ... are columns
colMeans(x, dims = 1)

# for dims = 2, x[,,1], x[,,2], x[,,3]
# are columns
colMeans(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, ]  1.5  7.5  1.5
[2, ]  3.5  9.5  3.5
[3, ]  5.5 11.5  5.5

[1] 3.5 9.5 3.5

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

K

Kanchan_Ray

Improve

Article Tags :

Similar Reads

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

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 â€˜columnsâ€™ to sum over. It is over dimensions 1:dims. Example 1: Python3 #

Calculate the cross-product of a Matrix in R Programming - crossprod() Function

crossprod() function in R Language is used to return the cross-product of the specified matrix. Syntax: crossprod(x) Parameters: x: numeric matrix Example 1: Python3 # R program to illustrate # crossprod function # Initializing a matrix with # 2 rows and 2 columns x <- matrix(1:4, 2, 2) # Getting

Calculate Median of elements of a Vector in R Programming - median() Function

median() function in R Language is used to calculate the median of the elements of the numeric vector passed as argument. Syntax: median(x, na.rm) Parameters: x: Numeric Vector na.rm: Boolean value to ignore NA Example 1: Python3 1== # R program to calculate median of a vector # Creating vector x1

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

rowSums() function in R Programming Language is used to compute the sum of rows of a matrix or an array. It simplifies the process of calculating the sum for each row, especially when dealing with large datasets, and can be applied to both numeric and logical data types.Syntax:rowSums(x, na.rm = FAL

Naming Rows and Columns of a Matrix in R Programming - rownames() and colnames() Function

rownames() function in R Language is used to set the names to rows of a matrix. Syntax: rownames(x) <- value Parameters: x: Matrix value: Vector of names to be set Example: Python3 1== # R program to provide a name # to rows of a Matrix # Creating a 3X3 Matrix A = matrix(c(1, 2, 3, 4, 5, 6, 7, 8,

Calculate the Mean of each Row of an Object in R Programming â€“ rowMeans() Function

rowMeans() function in R Language is used to find out the mean of each row of a data frame, matrix, or array. Syntax: rowMeans(data) Parameter: data: data frame, array, or matrix Example 1 Python3 1== # R program to illustrate # rowMean function # Create example values # Set seed set.seed(1234) # Cr

Getting a Matrix of number of columns in R Programming - col() Function

col() function in R Language is used to get a matrix which contains the number of columns of the matrix passed to it as argument. Syntax: col(x, as.factor=FALSE) Parameters: x: matrix as.factor: a logical value indicating whether the value should be returned as a factor of column labels (created if

Calculate the Median Absolute Deviation in R Programming - mad() Function

The Median Absolute Deviation is calculated in R Language using the mad() function. It is a statistical measurement of a dataset's dispersion or variability. Because it is resistant to outliers and extreme values, the MAD can serve as a robust alternative to standard deviation.The Median Absolute De

Calculate Cumulative Sum of a Numeric Object in R Programming - cumsum() Function

The cumulative sum can be defined as the sum of a set of numbers as the sum value grows with the sequence of numbers. cumsum() function in R Language is used to calculate the cumulative sum of the vector passed as argument. Syntax: cumsum(x)Â Parameters:Â x: Numeric Object Example 1:Â Python3 # R pr

Get or Set Dimensions of a Matrix in R Programming - dim() Function

The dim() function in R is used to get or set the dimensions of an object. This function is particularly useful when working with matrices, arrays, and data frames. Below, we will discuss how to use dim() to both retrieve and set dimensions, with examples for better understanding.Syntax: dim(x)Param