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-This is the Newton method for solving nonlinear equations, oh, um, using Matlab prepared by the three m documents, F is equations extreme vector function, JF its Jacobian matrix, Call newdim function final document