question regarding ntstool, pollution mortality example dataset

Question

John 2012-7-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44930-question-regarding-ntstool-pollution-mortality-example-dataset

回答： Greg Heath 2016-11-2

采纳的回答： Greg Heath

在 MATLAB Online 中打开

Hello,

I have a question regarding the ntstool (neural network time series).

There is an example dataset called pollution mortality that you can load into the GUI and learn how to train a network.

The following code is also in the GUI:

[X,T] = pollution_dataset;
net = narxnet(1:2,1:2,10);
[Xs,Xi,Ai,Ts] = preparets(net,X,{},T);
net = train(net,Xs,Ts,Xi,Ai);
view(net)
Y = net(Xs,Xi,Ai)
plotresponse(Ts,Y);

The dataset has 219 input timestamps. But when you execute this code, the graph has 500 timesteps.

Could anybody tell me if code is indeed predicting observations in the future? Where does it specify how many time steps to look ahead?

Thank you

John

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Answer 1

Greg Heath 2016-11-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44930-question-regarding-ntstool-pollution-mortality-example-dataset#answer_241658

在 MATLAB Online 中打开

 [X,T] = pollution_dataset;
net = narxnet(1:2,1:2,10);
[ Ic N ] = size(X) %[ 1 508]
[ Oc N ] = size(T))%[ 1 508]
x = cell2mat(X);
t = cell2mat(T);
[ I N ] = size(x) %[ 8 508]
[ O N ] = size(t))%[ 3 508]