[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： ]Wkgpfd56  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); i-v: %  
net.trainParam.show = 50; xcW\U^1d  
net.trainParam.lr = 0.05; 9lYfII}4(  
net.trainParam.epochs = 300; H^n@9U;[K
 
net.trainParam.goal = 1e-5; h^=;
\ng1l  
p = [-1 -1 2 2;0 5 0 5]; .S54:vs  
t = [-1 -1 1 1]; Hj{.{V  
net=train(net,p,t); 2(DhKHrF  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 #E!^oZm<Z  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 [oU\l+t  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 NuR7pjNMZ  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 ~ q-Z-MA  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 x>EL|Q=?  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 -8qCCV&1i  
TRAINGD, Performance goal met. >1!u]R<3  
a = sim(net,p) b VEJ  
plot(p,t,p,a,'o') 9{;L7`<  
但是为什么老是报错： GoybkwFjZ  
??? Input argument "net" is undefined. >p
-UQc