Ruby | Matrix permutation? function

The permutation?() is an inbuilt method in Ruby returns a boolean value. It returns true if it is a permutation matrix, else it returns false. It returns error if anything other than square matrix is used.

Syntax: mat1.permutation?() Parameters: The function needs the matrix to be checked for permutation matrix or not. Return Value: It returns true if it is a permutation matrix, else it returns false.

Example 1: 

CPP

#Ruby program for permutation ? () method in Matrix

#Include matrix
require "matrix"

#Initialize a matrix
    mat1
    = Matrix[[ 1, 21 ], [ 31, 18 ]]

#Prints if permutation ? or not
      puts mat1.permutation
    ? ()

Output:

false

Example 2: 

CPP

#Ruby program for permutation ? () method in Matrix

#Include matrix
require "matrix"

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

#Prints if permutation ? or not
      puts mat1.permutation
    ? ()

Output:

true