P=[1 1 2 2 -1 -2 -1 -2; 1 2 -1 0 2 1 -1 -2]
T=[0 0 0 0 1 1 1 1; 0 0 1 1 0 0 1 1]
net=newp(minmax(P),2,'hardlim','learnp');   % minmax(P)=[ -2  2; -2  2]
net.IW{1,1}=randn(2);  
net.b{1}=randn(2,1);       
a=sim(net,P)             % 還沒開始學，顯示結果不正確
net=train(net,P,T);
net.IW{1,1}
net.b{1}
a=sim(net,P)             %學習結果
figure; plotpv(P,T); hold on;  plotpc(net.IW{1},net.b{1});