Function main

dependence/eigen-3.4.0/doc/examples/function_taking_ref.cpp:12–19

}

int main()
{
  Matrix4f m = Matrix4f::Random();
  cout << "matrix m:" << endl << m << endl << endl;
  cout << "inv_cond(m):          " << inv_cond(m)                      << endl;
  cout << "inv_cond(m(1:3,1:3)): " << inv_cond(m.topLeftCorner(3,3))   << endl;
  cout << "inv_cond(m+I):        " << inv_cond(m+Matrix4f::Identity()) << endl;
}