threed-beam-fea/ext/eigen-3.3.4/bench/bench_sum.cpp

19 lines
320 B
C++

#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;
}