[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： &tZG @  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); )'
hH^(Yu  
net.trainParam.show = 50; D!oc>K$B  
net.trainParam.lr = 0.05; R'dSbn  
net.trainParam.epochs = 300; ; h`0ir4[A  
net.trainParam.goal = 1e-5; R.s^o]vT  
p = [-1 -1 2 2;0 5 0 5]; 2~*Ez!.3  
t = [-1 -1 1 1]; k`{@pt.  
net=train(net,p,t); S8l1"/?aHE  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 AWjm~D-?  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 N,J9Wu ZJ\  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 .p ls!  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 ?hR7<02  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 p:OPwD+  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 {0@&OO:w  
TRAINGD, Performance goal met. HJC(\\~  
a = sim(net,p) \NGC$p n  
plot(p,t,p,a,'o') ?|1Mv1C?  
但是为什么老是报错： teW6;O_  
??? Input argument "net" is undefined. CAU0)=M