最速下降法，优化算法的一种，具有二次收敛性，若目标函数为二次正定函数，经有限步可达到极小点-Steepest descent method, an algorithm with quadratic convergence, if the objective function is quadratic positive definite function can be achieved by the finite step minima

实现了最速下降法的算法，具体实例操作，可运行出结果，分子程序书写，简便易懂。-The algorithm of the steepest descent method, and specific examples, you can run the results, the molecular program written in easy to understand.

自己用matlab写的一个期末考试的代码，用最速下降法求解极值点，在MATLAB2015b上能够完美运行(I wrote a final exam with matlab code, using steepest descent method to solve extreme points, in MATLAB2015b can be perfect operation)