1*bf2c3715SXin Li #include <iostream> 2*bf2c3715SXin Li #include <Eigen/Dense> 3*bf2c3715SXin Li 4*bf2c3715SXin Li using namespace std; 5*bf2c3715SXin Li using namespace Eigen; 6*bf2c3715SXin Li main()7*bf2c3715SXin Liint main() 8*bf2c3715SXin Li { 9*bf2c3715SXin Li Matrix2f A, b; 10*bf2c3715SXin Li LLT<Matrix2f> llt; 11*bf2c3715SXin Li A << 2, -1, -1, 3; 12*bf2c3715SXin Li b << 1, 2, 3, 1; 13*bf2c3715SXin Li cout << "Here is the matrix A:\n" << A << endl; 14*bf2c3715SXin Li cout << "Here is the right hand side b:\n" << b << endl; 15*bf2c3715SXin Li cout << "Computing LLT decomposition..." << endl; 16*bf2c3715SXin Li llt.compute(A); 17*bf2c3715SXin Li cout << "The solution is:\n" << llt.solve(b) << endl; 18*bf2c3715SXin Li A(1,1)++; 19*bf2c3715SXin Li cout << "The matrix A is now:\n" << A << endl; 20*bf2c3715SXin Li cout << "Computing LLT decomposition..." << endl; 21*bf2c3715SXin Li llt.compute(A); 22*bf2c3715SXin Li cout << "The solution is now:\n" << llt.solve(b) << endl; 23*bf2c3715SXin Li } 24