[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： 1pYmtr  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); 7Ap~7)z[  
net.trainParam.show = 50; NIWI6qCw  
net.trainParam.lr = 0.05; e"v[)b++Y  
net.trainParam.epochs = 300; LX(iuf+l  
net.trainParam.goal = 1e-5; ~vjr;a(B  
p = [-1 -1 2 2;0 5 0 5]; clR?< LO  
t = [-1 -1 1 1]; `a/P
Ic"  
net=train(net,p,t); M<M#<kD  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 {"gyXDE1  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 Pi"tQyw39$  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 }]n>A  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 , $D&WH  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 uV/HNzC  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 0T{c:m~QXe  
TRAINGD, Performance goal met. xi1N? pP  
a = sim(net,p) Dbkuh!R  
plot(p,t,p,a,'o') ^ T:qT*v  
但是为什么老是报错： ^NnU gj  
??? Input argument "net" is undefined. Ls$g-k%c@Q