# Ruby program for trace() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[3, 12], [2, 8]]  
  
# Prints the trace
puts  mat1.trace()

11

# Ruby program for trace() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[1, 0, 6], [6, 1, 7], [1, 2, 19]]   
  
# Prints the trace
puts  mat1.trace()

21