Error NARX Model Prediction

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Seda 2024-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/2089476-error-narx-model-prediction

评论： Seda 2024-4-18

Hello everyone...

Im doing a carbon emission(output) with multiple input using neural network approached (NARX). I trained the model using NARX tollbox. I couldn't find the code I needed to write to predict the next 8 years. It doesn't give any predictions in the code I wrote... Would you mind to help me ? Where is the mistake :( My code;

x=xlsread('Input.xlsx');
t=xlsread('Output.xlsx');
X = tonndata(x,false,false);
T = tonndata(t,false,false);
trainFcn = 'trainlm';
inputDelays = 1:2;
feedbackDelays = 1:2;
hiddenLayerSize = 10;
net = narxnet(inputDelays,feedbackDelays,hiddenLayerSize,'open',trainFcn);
[x,xi,ai,t] = preparets(net,X,{},T);
net.divideParam.trainRatio = 80/100;
net.divideParam.valRatio = 10/100;
net.divideParam.testRatio = 10/100;
[net,tr] = train(net,x,t,xi,ai);
y = net(x,xi,ai);
e = gsubtract(t,y);
performance = perform(net,t,y)
view(net)
netc = closeloop(net);
netc.name = [net.name ' - Closed Loop'];
view(netc)
[xc,xic,aic,tc] = preparets(netc,X,{},T);
yc = netc(xc,xic,aic);
closedLoopPerformance = perform(net,tc,yc)
nets = removedelay(net);
nets.name = [net.name ' - Predict One Step Ahead'];
view(nets)
[xs,xis,ais,ts] = preparets(nets,X,{},T);
ys = nets(xs,xis,ais);
stepAheadPerformance = perform(nets,ts,ys)
numFutureSteps = 8;
predictedValues = cell(1, numFutureSteps);
[~, lastInputState, lastLayerState] = preparets(netc, X, {}, T);
lastOutput = yc{end};
for i = 1:numFutureSteps
    [nextOutput, nextInputState, nextLayerState] = netc({lastOutput}, lastInputState, lastLayerState);
    predictedValues{i} = nextOutput;
    lastOutput = nextOutput;
    lastInputState = nextInputState;lastLayerState = nextLayerState;