1#include <iostream> 2#include <Eigen/Core> 3using namespace Eigen; 4using namespace std; 5 6int main() 7{ 8 typedef Matrix<SCALAR,Eigen::Dynamic,1> Vec; 9 Vec v(SIZE); 10 v.setZero(); 11 v[0] = 1; 12 v[1] = 2; 13 for(int i = 0; i < 1000000; i++) 14 { 15 v.coeffRef(0) += v.sum() * SCALAR(1e-20); 16 } 17 cout << v.sum() << endl; 18} 19