repeat the iteration with an error using try/catch

Question

Mos_bad 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/515188-repeat-the-iteration-with-an-error-using-try-catch

编辑： James Tursa 2020-4-4

I wrote a nested for loop to exexcute a huge number of iterations. However, sometimes an error stops the program. I want to repeat the iEv'th iteration in case an error occurs and then continue to next iteration. Please see below the code and let me know if it should be modified.

for iTcm=1:nTcm  
    for iScen=1:nScen
        for iEv=1:nEv
            try
              MyProgramHere
            catch ME
                disp(ME);
                fprintf('Retrying the program...\n');
            end
        end
    end
end

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Answer 1

James Tursa 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/515188-repeat-the-iteration-with-an-error-using-try-catch#answer_423866

编辑：James Tursa 2020-4-3

在 MATLAB Online 中打开

Maybe this construct does what you want

            while( true )
                try
                  MyProgramHere
                  break
                catch ME
                    disp(ME);
                    fprintf('Retrying the program...\n');
                end
            end

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Mos_bad 2020-4-3

This code didn't work either. Any help?

James Tursa 2020-4-3

编辑：James Tursa 2020-4-4

在 MATLAB Online 中打开

No. I meant exactly what I wrote, without this line:

iEv = iEv - 1; % delete this line

By getting rid of this line, it will keep repeating the same iteration indefinitely until it passes. iEv doesn't change until you do the iteration successfully. If you want a limit on the number of tries before you generate an error then additional code would need to be added.

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Answer 2

darova 2020-4-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515188-repeat-the-iteration-with-an-error-using-try-catch#answer_423861

编辑：darova 2020-4-3

在 MATLAB Online 中打开

My proposition

for iTcm=1:nTcm  
    for iScen=1:nScen
        iEv = 0;
        while  iEv <= nEv
            iEv = iEv + 1;
            try
              MyProgramHere
            catch ME
                iEv = iEv-1;
                disp(ME);
                fprintf('Retrying the program...\n');
            end
        end
    end
end

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darova 2020-4-3

What about this. I improved my code

Mos_bad 2020-4-3

With the improved code, when the iEv count reaches to nEv, the program control goes immediately to the catch block. So the program stops without going to (iScen+1)th iteration.

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