# Ruby program for det() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[1, Complex(2, 1)], [Complex(8, -9), 18]]       
  
# prints the determinant 
puts  mat1.det()

-7+10i

# Ruby program for det() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[1, 1, 5], [4, 1, 5], [11, 2, 12]]       
  
# prints the determinant 
puts  mat1.det()

-6