func int main(){
  matrix col1 <2, 1> = [3.0; 1.0];
  matrix col2 <2, 1> = [2.0; 4.0];
  matrix arr <2,2> = [col1, col2];
  int a = 1;
  double b = -arr[0,0] - arr[1,1];
  double c = arr[0,0] * arr[1,1] - arr[0,1] * arr[1,0];
  double eigv1 = ( -b + sqrt(b*b - 4 * a * c)) / (2 * a);
  double eigv2 = ( -b - sqrt(b*b - 4 * a * c)) / (2 * a); 

  print("Calculate eigenvalue:");
  print(eigv1);
  print(eigv2);
  return 0;
}
