%創建一個BP網絡
net = newff([-2 2],[4 1],{'tansig','purelin'},'trainlm','learngdm','msereg');
p = [-2 -1 0 1 2];
t = [0 1 1 1 0];
y = sim(net,p)
%誤差向量
e = t-y  
%設置性能參數
net.performParam.ratio = 20/(20+1);  
perf = msereg(e,net)