2, ||grad||_infty = 7.14e-02
Iter   480, f(x) = 5.862028e+02, ||grad||_infty = 1.27e-01
Iter   490, f(x) = 5.862019e+02, ||grad||_infty = 8.58e-02
Iter   500, f(x) = 5.861960e+02, ||grad||_infty = 1.39e-01
Iter   510, f(x) = 5.861923e+02, ||grad||_infty = 1.04e-01
Iter   520, f(x) = 5.861899e+02, ||grad||_infty = 5.11e-02
Iter   530, f(x) = 5.861883e+02, ||grad||_infty = 7.26e-02
Iter   540, f(x) = 5.861877e+02, ||grad||_infty = 2.21e-02
Iter   550, f(x) = 5.861871e+02, ||grad||_infty = 4.50e-02
Iter   560,