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 equat