[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： IgC)YIhd  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); BoP%f'0N  
net.trainParam.show = 50; 9U58#  
net.trainParam.lr = 0.05; H(]lqvO  
net.trainParam.epochs = 300; Tm_vo-  
net.trainParam.goal = 1e-5; g4d5G=y  
p = [-1 -1 2 2;0 5 0 5]; 7F3Hkvd[k  
t = [-1 -1 1 1]; 96vv85g  
net=train(net,p,t); nP?(9;3*  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 sEdWB
T 8  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 Bw"L!sZ  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 [j}%&
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TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 .F)b9d[?  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 ;oC85I  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 8ne'x!1 D  
TRAINGD, Performance goal met. itD1r?O{pV  
a = sim(net,p) 8&ZUkDGkJ  
plot(p,t,p,a,'o') sXl7  
但是为什么老是报错： *ARro Ndr  
??? Input argument "net" is undefined. d"5:/Mo