
Iter    20, f(x) = 5.094910e+01, ||grad||_infty = 4.21e+00
Iter    30, f(x) = 4.495606e+01, ||grad||_infty = 2.25e+00
Iter    40, f(x) = 4.154133e+01, ||grad||_infty = 1.92e+00
Iter    50, f(x) = 4.067009e+01, ||grad||_infty = 2.14e+00
Iter    60, f(x) = 3.996698e+01, ||grad||_infty = 1.80e+00
Iter    70, f(x) = 3.964063e+01, ||grad||_infty = 1.45e+00
Iter    80, f(x) = 3.941584e+01, ||grad||_infty = 5.82e-01
Iter    90, f(x) = 3.935186e+01, ||grad||_infty = 2.06e-01
Iter   100, f(x) = 3.933107e+01, ||grad