X=-1:0.1:1;T=sin(pi*X);
plot(X,T,'+');
%建立網(wǎng)絡(luò)，并得權(quán)值和偏值
[R,N]=size(X);[S2,N]=size(T);S1=5;
[W1,b1,W2,b2]=initff(X,S1,'tansig',S2,'purelin');
%利用不含噪聲的理想輸入數(shù)據(jù)訓(xùn)練網(wǎng)絡(luò)，并得權(quán)重和偏值
disp_freq=10;                     %顯示間隔
max_epoch=8000;                   %訓(xùn)練時(shí)間
err_goal=0.02;                    %訓(xùn)練目標(biāo)誤差
lr=0.01;                          %學(xué)習(xí)速率
mc=0.95;                          %動(dòng)量因子
tp=[disp_freq max_epoch err_goal lr mc];
[W1,b1,W2,b2,te,tr]=trainbpx(W1,b1,'tansig',W2,b2,'purelin',X,T,tp);
X1=0.5;
[y1,y2]=simuff(X1,W1,b1,'tansig',W2,b2,'purelin');
y2