#Ruby program for inv() method in Matrix
  
#Include matrix
require "matrix"
  
#Initialize a matrix
    mat1
    = Matrix[[ Complex(1, 2), 21 ], [ 31, Complex(9, 12) ]]
  
#prints the inv matrix
      puts mat1.inv()

Matrix[[-313/24692-459/24692i, 777/24692+35/24692i], [1147/24692+155/74076i, -101/74076-227/74076i]]

#Ruby program for inv() method in Matrix
  
#Include matrix
require "matrix"
  
#Initialize a matrix
    mat1
    = Matrix[[ 1, -8 ], [ -2, -8 ]]
  
#prints the inv matrix
      puts mat1.inv()

Matrix[[1/3, -1/3], [-1/12, -1/24]]