[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： @ vudeaup  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); EtG)2)  
net.trainParam.show = 50; >skS`/6  
net.trainParam.lr = 0.05;  O@$i
 
net.trainParam.epochs = 300; K!mgh7Dx  
net.trainParam.goal = 1e-5; Q^OzFfR6  
p = [-1 -1 2 2;0 5 0 5];
glUP  
t = [-1 -1 1 1]; mUw,q;{  
net=train(net,p,t); }2{#=Elh  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 )$i3j 1[;  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 YKk%;U*  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 |F`'m":$m  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 VN;M;fMs  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 %mJ)pMV  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 %Z|*!A+wN5  
TRAINGD, Performance goal met. WBdb[N6\  
a = sim(net,p) [8n4lE[)"  
plot(p,t,p,a,'o') ??;[`_h{bz  
但是为什么老是报错： xg&vZzcl  
??? Input argument "net" is undefined. 5 Da(DA