function net=BPNET(XX,YY)
%--------------------------------------------------------------------------
%  BPNET.m
%  創建并訓練BP神經網絡
%--------------------------------------------------------------------------
%數據歸一化預處理
nntwarn off
XX=premnmx(XX);
YY=premnmx(YY);
%創建網絡
net=newff(minmax(XX),[19,25,1],{'tansig','tansig','purelin'},'trainlm');
%設置訓練參數
net.trainParam.show=1;
net.trainParam.lr=1;
net.trainParam.epochs=50;
net.trainParam.goal=0.001;
%訓練網絡
net=train(net,XX,YY);