www.gusucode.com > MATLAB神经网络实例与精析随书源程序 > 第6章 BP神经网络/code/example6_3.m
% example6_3.m x=-4:.5:4; y=x.^2-x; net=newff(minmax(x),minmax(y),10); % net为新版newff创建的 net=train(net,x,y); % 训练 xx=-4:.2:4; yy=net(xx); plot(x,y,'o-',xx,yy,'*-') title('新版newff') net1=newff(minmax(x),[10,1],{'tansig','purelin'},'trainlm'); % net1为旧版newff创建的 net1=train(net1,x,y); % 训练 yy2=net1(xx); figure(2); plot(x,y,'o-',xx,yy2,'*-') title('旧版newff')