1#include <iostream>
2#include <Eigen/Dense>
3
4using namespace std;
5using namespace Eigen;
6
7int main()
8{
9   Matrix3f A;
10   A << 1, 2, 1,
11        2, 1, 0,
12        -1, 1, 2;
13   cout << "Here is the matrix A:\n" << A << endl;
14   cout << "The determinant of A is " << A.determinant() << endl;
15   cout << "The inverse of A is:\n" << A.inverse() << endl;
16}