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function [ output_args ] = Gong_E( input_args ) 
%GONG_E Summary of this function goes here 
%  Detailed explanation goes here 
times=1,  circles=1; 
x1=input('请输入初始点[x1,x2]='); 
s=input('请输入精度s='); 
xk=x1; 
xk_1=x1; 
d_x1=D_F(x1);%求出初始点导数 
d_xk=d_x1; 
d_xk_1=d_x1; 
if(norm(d_x1,2)s) 
       z_k=-D_F(x1); 
       while(times<3) 
           circles=circles+1; 
           p=min_F1(xk,z_k); 
           xk_1=xk+p.*z_k; 
           d_xk_1=D_F(xk_1);%k+1 gradient 
           if(norm(d_xk_1)