Quasi-Newton minimization of Rosenbrock's function:
initial vector :        18         15 
f(initial)     : 9548389.0
calling quasi_newton...
function calls: 511
solution       :         1     0.9999 
f(solution)    : 1.439902626187146e-09

Quasi-Newton minimization of Himmelblau's function:
initial vector :        18         15 
f(initial)     : 163280.0
calling quasi_newton...
function calls: 61
solution       :    -3.779     -3.283 
f(solution)    : 3.428541916152411e-11