predicting unknown value in time series

Hi I have a problem in predicting the next unknown value in
a time series.

How to make this code piece predict value number 601? The
code is a matlab example;

load laser
y = y(1:600)';
y = con2seq(y);

ftdnn_net = newfftd(y,y,[1:8],5);
ftdnn_net.trainParam.show = 10;
ftdnn_net.trainParam.epochs = 50;

p = y(9:end);
t = y(9:end);
Pi=y(1:8);
ftdnn_net = train(ftdnn_net,p,t,Pi);

yp = sim(ftdnn_net,p,Pi);
yp = cell2mat(yp);
e = yp-cell2mat(t);
rmse = sqrt(mse(e))

Thanks

.

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