[求助]新手求助~（关于初级的神经网络问题） [复制链接]

各位大虾，我在网上看到的教程里的一个程序段，本来想要试试看的： {v>8Kp7_R  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); Gr8%%]1!0  
net.trainParam.show = 50; v9
"|VhZ  
net.trainParam.lr = 0.05; Ls6C*<8  
net.trainParam.epochs = 300; cyTBp58  
net.trainParam.goal = 1e-5; .Q5zmaA]  
p = [-1 -1 2 2;0 5 0 5]; o*sss  
t = [-1 -1 1 1]; u?7^+z  
net=train(net,p,t); =)YDjd_=z  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 ;FnU[Q`M#L  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 GFTOP%Tgl  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 >1  %|T  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 K3xt,g  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 Jt(RF
*i  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 u2 t=*<X  
TRAINGD, Performance goal met. ^/ZNdwx  
a = sim(net,p) -^ R?O  
plot(p,t,p,a,'o')
76(/(v.x  
但是为什么老是报错： ?<efKs
 
??? Input argument "net" is undefined. l8H8c &