中文说明：这是牛顿法求解非线性方程组哦那个，用matlab编写的3个m文件，F是方程组左端向量函数，JF是其Jacobian矩阵，最后调用newdim函数文件
English Description：
This is the Newton method for solving nonlinear equations. Oh, that is, 3 M files written in MATLAB, F is the left vector function of the equation group, JF is its Jacobian matrix, and finally the newdim function file is called.