[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： a
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net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); o?uTL>Zin  
net.trainParam.show = 50; %Bg} a  
net.trainParam.lr = 0.05; Bt|S!tEy  
net.trainParam.epochs = 300; ry}CND(nB  
net.trainParam.goal = 1e-5; *EOIgQp  
p = [-1 -1 2 2;0 5 0 5]; >69xl^Gd  
t = [-1 -1 1 1]; xin<.)!E  
net=train(net,p,t); M9*7r\hqYV  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 En3Q%  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 7dI+aJ  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 X tZ0z?  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 Bn*D<<{T  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 5T}$+R0&  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 W|~Lmdzj  
TRAINGD, Performance goal met. Q/4g)(~J  
a = sim(net,p) AR'q2/cw  
plot(p,t,p,a,'o') |mV*HdqU  
但是为什么老是报错： }K9Vr!  
??? Input argument "net" is undefined. {y=H49