1#include <unsupported/Eigen/MatrixFunctions>
2#include <iostream>
3
4using namespace Eigen;
5
6int main()
7{
8  const double pi = std::acos(-1.0);
9
10  MatrixXd A(2,2);
11  A << cos(pi/3), -sin(pi/3),
12       sin(pi/3),  cos(pi/3);
13  std::cout << "The matrix A is:\n" << A << "\n\n";
14  std::cout << "The matrix square root of A is:\n" << A.sqrt() << "\n\n";
15  std::cout << "The square of the last matrix is:\n" << A.sqrt() * A.sqrt() << "\n";
16}
17