求助,在用MATLAB做神经网络预测,出现了图中的情况,mes=0,这不科学吧...答:function Out=bpnet(p,t,p_test)global S1 net=newff(minmax(p),[S1,size(t,1)],{'tansig','purelin'},'trainlm'); %trainlm训练函数最有效 net=newff(p,t,31,{'tansig','purelin'},'trainlm');%新版用法 net.trainParam.epochs=1000;net.trainParam.goal=0.00001;net.trainParam.lr...