[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： LwYWgT
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net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); G>Hg0u0!,  
net.trainParam.show = 50; =;Dj[<mJ45  
net.trainParam.lr = 0.05; <*(^QOM  
net.trainParam.epochs = 300; jn(%v]
 
net.trainParam.goal = 1e-5; >L')0<!&  
p = [-1 -1 2 2;0 5 0 5]; "+E\os72|  
t = [-1 -1 1 1]; _"*}8{|  
net=train(net,p,t); *:"@
  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 +z4E:v  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 Wdi`ZE  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 Zm0'p!  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 dci<Rz`h  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 (x fN=Te,-  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 "T9UedZ  
TRAINGD, Performance goal met. kH8/
8  
a = sim(net,p) NfUt\ p*  
plot(p,t,p,a,'o') >,[@SF%  
但是为什么老是报错： Ol~M BQs  
??? Input argument "net" is undefined. $<AaeyR!N