1 #include <iostream>
2 #include <Eigen/Dense>
3 
4 using namespace std;
5 using namespace Eigen;
6 
main()7 int 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 }
17