1#include <iostream>
2#include <Eigen/Dense>
3
4using namespace std;
5using namespace Eigen;
6
7int main()
8{
9   Matrix2f A, b;
10   A << 2, -1, -1, 3;
11   b << 1, 2, 3, 1;
12   cout << "Here is the matrix A:\n" << A << endl;
13   cout << "Here is the right hand side b:\n" << b << endl;
14   Matrix2f x = A.ldlt().solve(b);
15   cout << "The solution is:\n" << x << endl;
16}
17