[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： `JZ`j7f  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); U(~d^9/#  
net.trainParam.show = 50; M/LC:,  
net.trainParam.lr = 0.05; '<!T'l:R:/  
net.trainParam.epochs = 300; aBblP8)8;K  
net.trainParam.goal = 1e-5;
M\!z='Fi  
p = [-1 -1 2 2;0 5 0 5]; tYzpL  
t = [-1 -1 1 1]; qi]"`\  
net=train(net,p,t); 2t3DQ  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 y7@q]~%  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 @ |^;d  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 )d =8)9B  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 3o.9}`/  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 k@=w? m  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 TJ`Jqnh  
TRAINGD, Performance goal met. #k/N
S  
a = sim(net,p) 4.&hV?Kxz  
plot(p,t,p,a,'o') k%TjRf{p  
但是为什么老是报错： {IG5qi?/E)  
??? Input argument "net" is undefined. e:T8={LU2W