bench_sum.cpp
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	#include <iostream>
	#include <Eigen/Core>
	using namespace Eigen;
	using namespace std;

	int main()
	{
	typedef Matrix<SCALAR,Eigen::Dynamic,1> Vec;
	Vec v(SIZE);
	v.setZero();
	v[0] = 1;
	v[1] = 2;
	for(int i = 0; i < 1000000; i++)
	{
	v.coeffRef(0) += v.sum() * SCALAR(1e-20);
	}
	cout << v.sum() << endl;
	}