牛顿迭代法是解非线性方程组比较经典的方法；
拟牛顿法是为了解决求Jacobi矩阵时带来的困难，现已成为解决非线性方程组和最优化问题的最有效方法之一。(The Newton iterative method is a classic method for solving nonlinear equations.
The quasi Newton method is one of the most effective methods for solving the nonlinear equations and optimization problems, in order to solve the difficulties brought about by the Jacobi matrix.)