[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： )('{q}JxV  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); [A!=Hv_$  
net.trainParam.show = 50; \n#l+
R23  
net.trainParam.lr = 0.05; bDw\;bnG  
net.trainParam.epochs = 300; [sPLu)q2  
net.trainParam.goal = 1e-5; \q-["W34  
p = [-1 -1 2 2;0 5 0 5]; +C`vO5\0  
t = [-1 -1 1 1]; E9 #o0Di  
net=train(net,p,t); _cfAJ)8=  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 2qj0iRH#N<  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 0B`rTLwB  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 eBECY(QMQ  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 ? zic1i  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 aI\>=*HF  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 T5-'|+  
TRAINGD, Performance goal met. jI}{0LW&F&  
a = sim(net,p) _{i-.
;K  
plot(p,t,p,a,'o') 5FNf)F   
但是为什么老是报错： q=BAYZ\`  
??? Input argument "net" is undefined. q*J-ii