[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： Q{hK+z`D  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); j%!xb><  
net.trainParam.show = 50; kaZcYuT.9  
net.trainParam.lr = 0.05; CS^|="Zs  
net.trainParam.epochs = 300; =+e;BYD#!  
net.trainParam.goal = 1e-5; uL-$^],  
p = [-1 -1 2 2;0 5 0 5]; * se),CP!s  
t = [-1 -1 1 1]; FN0<
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net=train(net,p,t); ,|O|gh$s  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 m
7,"M~\pX  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 ?AQR\)P  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 +
+kVq$9@y  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 \a:-xwUu<  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 uN&49o  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 J@Nq  
TRAINGD, Performance goal met. yX\~{%  
a = sim(net,p) 1 RyvPP  
plot(p,t,p,a,'o') Kn+
B):OY+  
但是为什么老是报错： 3k+46Wp  
??? Input argument "net" is undefined. f<DqA/$