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