t=0:0.1:99.9; y=ones(1,1000)*5; w1=[0.12,0.3]; %初始化输入层隐含层连接权值 w2=[0.2,0.4]; %初始化隐含层与输出层连接权值 d1=[0.5,0.6]; %初始化隐含层阀值 d2=0.3; %初始化输出层阀值 u1=zeros(1,2); %初始化隐含层输入 a1=zeros(1,2); %初始化隐含层输出 e=zeros(1000); %初始化误差 r=0.1; %学习速率 for q=1:1:1000 for i=1:1:1000 u1(1)=w1(1)*t(i)-d1(1); u1(2)=w2(2)*t(i)-d1(2); a1(1)=1/(1+exp(-u1(1))); a1(2)=1/(1+exp(-u1(2))); out=a1(1)*w2(1)+a1(2)*w2(2)-d2; e(i)=y(i)-out; %%更新权值 w2(1)=w2(1)+r*a1(1)*e(i); w2(2)=w2(2)+r*a1(2)*e(i); w1(1)=w1(1)+r*a1(1)*(1-a1(1))*t(i)*w2(1)*e(i); w1(2)=w1(2)+r*a1(2)*(1-a1(2))*t(i)*w2(2)*e(i); %%更新阀值 d1(1)=d1(1)+0.1*a1(1)*(1-a1(1))*w2(1)*e(i); d1(2)=d1(2)+0.1*a1(2)*(1-a1(2))*w2(2)*e(i); end end t1=0:0.1:100.9 y1=zeros(1,1010); for i=1:1:1010 u1(1)=w1(1)*t1(i)-d1(1); u1(2)=w2(2)*t1(i)-d1(2); a1(1)=1/(1+exp(-u1(1))); a1(2)=1/(1+exp(-u1(2))); out=a1(1)*w2(1)+a1(2)*w2(2)-d2; y1(i)=out; end plot(t,y,t1,y1,'r'); 虽然只能辨识y=C但是还是很兴奋 |
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