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t=tan(pi*p/25)+sin(p)
net=newff(minmax(p),[20,1],{'tansig','purelin'},'trainlm');
net.trainParam.epochs=2500;
net.trainParam.goal=0.001;
net=train(net,p,t);
r=sim(net,p);
plot(p,r,p,t,'*');
net.trainParam.epochs=100;
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