1*bf2c3715SXin Li MatrixXd X = MatrixXd::Random(4,4); 2*bf2c3715SXin Li MatrixXd A = X * X.transpose(); 3*bf2c3715SXin Li cout << "Here is a random positive-definite matrix, A:" << endl << A << endl << endl; 4*bf2c3715SXin Li 5*bf2c3715SXin Li SelfAdjointEigenSolver<MatrixXd> es(A); 6*bf2c3715SXin Li cout << "The inverse square root of A is: " << endl; 7*bf2c3715SXin Li cout << es.operatorInverseSqrt() << endl; 8*bf2c3715SXin Li cout << "We can also compute it with operatorSqrt() and inverse(). That yields: " << endl; 9*bf2c3715SXin Li cout << es.operatorSqrt().inverse() << endl; 10