for loop won't stop using break

Question

Yanxin Liu 2021-2-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/736652-for-loop-won-t-stop-using-break

评论： Yanxin Liu 2021-5-9

I'm using ARMA to simulate and predict a series of data. "i" represens the number of pre-sample for ARMA estimate and "j" represents the number of estimation sample for ARMA estimate.

The absolute percentage errors (APE) are calculated for different numbers of pre-sample and estimate sample data.

I want to stop the loop when the APE is small than 0.05. I used break function, but it won't stop until it finishes all the loops (till i=60, j=60)

Mdl = arima(1,0,0);
APE = zeros(60,108);
for i = 12:60
    for j = i:120-i
        EstMdl = estimate(Mdl,Y_out((i+1):(i+j)),'Y0',Y_out(1:i));
        gasforecast = forecast(EstMdl,180-i-j,'Y0',Y_out((i+1):(i+j)));
        APE(i,j) = abs(gasforecast(end)-Y_out(end))/Y_out(end);
        if APE(i,j) < 0.05
            break;
        end
    end
end

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Answer 1

Walter Roberson 2021-2-4

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/736652-for-loop-won-t-stop-using-break#answer_615092

在 MATLAB Online 中打开

Mdl = arima(1,0,0);
APE = zeros(60,108);
stopping = false;
for i = 12:60
    for j = i:120-i
        EstMdl = estimate(Mdl,Y_out((i+1):(i+j)),'Y0',Y_out(1:i));
        gasforecast = forecast(EstMdl,180-i-j,'Y0',Y_out((i+1):(i+j)));
        APE(i,j) = abs(gasforecast(end)-Y_out(end))/Y_out(end);
        if APE(i,j) < 0.05
            stopping = true;
            break;
        end
    end
    if stopping; break; end
end