Ruby | Matrix diagonal?() function

The diagonal?() is an inbuilt method in Ruby returns true if the given matrix is diagonal, else it returns false. A diagonal matrix is a matrix in which the entries outside the main diagonal are all zero.

Syntax: mat1.diagonal?()

Parameters: The function does not accepts any parameter.

Return Value: It returns true if the given matrix is diagonal, else it returns false.

Example 1:

# Ruby program for diagonal?() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 = Matrix[[1, 0], [0, 2]]

# prints if diagonal matrix or not
puts  mat1.diagonal?()

Output:

true

Example 2:

# Ruby program for diagonal?() method in Matrix

# Include matrix
require "matrix"

# Initialize a matrix
mat1 =  Matrix[[1, 1, 5], [4, 1, 5], [11, 2, 12]]

# prints the result
puts  mat1.diagonal?()

Output:

false