[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： Fal##6B  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); jmORKX+)  
net.trainParam.show = 50; fk*I
}pDx  
net.trainParam.lr = 0.05; Y
amu"#  
net.trainParam.epochs = 300; % _.kd"  
net.trainParam.goal = 1e-5; eW<|I  
p = [-1 -1 2 2;0 5 0 5]; |lDxk
[  
t = [-1 -1 1 1]; \=1$$EDS9  
net=train(net,p,t); F>F2Yql&W  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 &u`]Zn  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 ?2(52?cJ  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 PEr &|H2  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 ~:krJ[=  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 u+7S/9q8  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 8(zE^W,[8"  
TRAINGD, Performance goal met. 8l.bT|#O  
a = sim(net,p) G+~f  
plot(p,t,p,a,'o') mAM:Q*a'  
但是为什么老是报错： Rs@>LA  
??? Input argument "net" is undefined. =?3b3PZn