[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： Z)V m,n
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net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); l ~bjNhk  
net.trainParam.show = 50; =D&xw2  
net.trainParam.lr = 0.05; xg:r5Z/|)  
net.trainParam.epochs = 300; $5(_U  
net.trainParam.goal = 1e-5; R,Gr{"H  
p = [-1 -1 2 2;0 5 0 5]; Sn o7Ru2  
t = [-1 -1 1 1]; 
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net=train(net,p,t); XsH(8-n0  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 JPo.&5k  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 rwZI;t$hf  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 }"$2F0  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 ^*6So3
 
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 Yg @&@S]  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 .,-,@ZK  
TRAINGD, Performance goal met. gKp5*  
a = sim(net,p) Z`FEB0$  
plot(p,t,p,a,'o') "ITC P<+  
但是为什么老是报错： y15 MWZ  
??? Input argument "net" is undefined. K;n2mXYGM