Question: Just Getting Started with NARX NN

Hi.

Just getting into the NN Toolbox. I have an error with PREPARETS that I don't full understand.

Context of the environment: inputs--> 4x1500 and outputs--> 1x1500

x=inputs;
t=outputs;
net = narxnet(1:2,1:2,10,'open','trainbr')
[X,Xi,Ai,T] = preparets(net,x,{},t);
net = train(net,X,T,Xi,Ai);
view(net)
Y = net(X,Xi,Ai)
perf = perform(net,Y,T)

Error:

Index exceeds matrix dimensions.

Error in preparets (line 293) xi = xx(:,FBS+((1-net.numInputDelays):0));

Error in cup (line 5) [X,Xi,Ai,T] = preparets(net,x,{},t);

Since I'm starting out with the NNTOOL box, I wanted go simple. It surprised me that I get an error with the simple example code referenced in the help guide.

My gut says that I have not aligned the default function inputs with the array size of my data.

But I'm open to feedback and steer from others.

Thanks

Answer 1

[Greg Heath]

IN ORDER OF PREFERENCE, the best way to get help is

 1a. Demonstrate with the MATLAB help or doc dataset example

 help narxnet

 doc narxnet

 or a minor modification (e.g., 4 inputs)

 1b. Demonstrate with one of the additional MATLAB example datasets

 help nndatasets

 doc nndatasets

 or a minor modifcation

 1c. Demonstrate with your own DOWNLOADED dataset

2. Use as few modifications in the help/doc documentation code as possible.

Otherwise, help is not guaranteed.

Hope this helps.

Greg