MATLAB: Neural network inputs and Outputs with different time delay

narxneural network

It is possible to configure and train a NN with diffrent time delays in the MATLAB neural network tool box such as:
 Y(t)=F(x(t),x(t-4),x(t-7),y(t-1),y(t-3)) with F the model.
or
 Y(t)=F(x1(t-1),x2(t-2),x4(t-4))
Unfortunately NARX work only with same time delay for all inputs and outputs
Thanks

Best Answer

Incorrect.
The number and values of ID and FD are independent.
Simple example:
 close all, clear all, clc, plt=0
 [X,T] = simplenarx_dataset;
     net = narxnet(1,1:2,10);
     view(net)
     [Xs,Xi,Ai,Ts] = preparets(net,X,{},T);
     whos
     rng(0)
     [net tr Ys Es Xf Yf] = train(net,Xs,Ts,Xi,Ai);
     view(net)
     whos
     ts = cell2mat(Ts);
     MSE00 = var(ts,1)           % 0.099154
     ys = cell2mat(Ys);
     es = cell2mat(Es);
     R2 = 1-mse(es)/MSE00         % 1
     plt=plt+1,figure(plt)
     hold on
     plot(ts,'o','LineWidth',2)
    plot(ys,'r--','LineWidth',2)
Hope this helps.
Thank you for formally accepting my answer
Greg
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