 f(x) = 5.861869e+02, ||grad||_infty = 6.50e-02
Iter   570, f(x) = 5.861868e+02, ||grad||_infty = 2.86e-02
Iter   580, f(x) = 5.861860e+02, ||grad||_infty = 2.24e-02
Iter   590, f(x) = 5.861859e+02, ||grad||_infty = 2.18e-02
Iter   600, f(x) = 5.861857e+02, ||grad||_infty = 1.93e-02
Iter   610, f(x) = 5.861856e+02, ||grad||_infty = 3.24e-02
Iter   620, f(x) = 5.861854e+02, ||grad||_infty = 1.61e-02
Iter   630, f(x) = 5.861853e+02, ||grad||_infty = 2.29e-02
Iter   640, f(x) = 5.861852e+02, ||grad||_infty = 8