[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： Y}ng_c  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); - %|P  
net.trainParam.show = 50; q]px(  
net.trainParam.lr = 0.05; 5MxH)~VQoM  
net.trainParam.epochs = 300; & g:%*>7P  
net.trainParam.goal = 1e-5; A t{U~^  
p = [-1 -1 2 2;0 5 0 5]; SSE3tcRRl  
t = [-1 -1 1 1]; u?F (1iN=  
net=train(net,p,t); ^|#>zCt^  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 .(|+oHg<  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 }|Uj"e  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 RU0i#suiz  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 Uo2+:p  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 s`"OM^[-  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 wUoiXi09  
TRAINGD, Performance goal met. G$C}?"l  
a = sim(net,p) ]ni6p&b>  
plot(p,t,p,a,'o') d<x1*a  
但是为什么老是报错： /HkFlf
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??? Input argument "net" is undefined. 'WQdr(