牛顿迭代法求非线性方程的根 调用格式：f_name函数名； x0初值； xmin,xmax：x坐标； n_point描绘曲线所用点数-Newton iteration of nonlinear equations for root Call format: f_name function names x0 initial value xmin, xmax: x coordinates n_point curve described by points

复杂网络，小世界网络NW的C++代码，并求了其度分布。-Networks, small world network NW in C++ code, and find out the degree distribution.