newton迭代解非线性方程组,使用工具是MATLAB,方便简单，程序清洗。-newton iterative solution of nonlinear equations, using the tools MATLAB, convenient and simple procedure to clean.

用LU分解法解线性方程组Ax=b。用牛顿法求非线性方程f(x)=0-With the LU decomposition method of solving linear equations Ax = b. Using Newton s method for nonlinear equation f (x) = 0