Check if a Matrix is Symmetric or not in R Programming – isSymmetric() Function

isSymmetric() function in R Language is used to check if a matrix is a symmetric matrix. A Symmetric matrix is one whose transpose is equal to the matrix itself.

Syntax: isSymmetric(x)

Parameters:
x: Matrix to be checked

Example 1:

# R program to check if
# a matrix is symmetric

# Creating a diagonal matrix
x1 <- diag(3)

# Creating a matrix
x2 <- matrix(c(1, 2, 2, 3), 2)

# Calling isSymmetric() function
isSymmetric(x1)
isSymmetric(x2)

Output:

[1] TRUE
[1] TRUE

Example 2:

# R program to check if
# a matrix is symmetric

# Creating a matrix
x1 <- matrix(c(1:9), 3, 3)

# Calling isSymmetric() function
isSymmetric(x1)

Output:

[1] FALSE