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:



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# 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?()

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Output:

true

Example 2:

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# 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?()

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Output:

false
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