MATLAB: Exit code from program

terminate

What is the code that terminates the program and stop it?

Best Answer

Try this:

again = true; % Flag for iterating the outer while loop again.
loopCounter1 = 1; % Count iterations to prevent infinite loop.  This is a "fail safe".

loopCounter2 = 1; % Count iterations to prevent infinite loop.  This is a "fail safe".
maxIterations = 9999; % Whatever is the most you ever expect.
while condition1 && again && loopCounter1 < maxIterations
  while condition2 && loopCounter2 < maxIterations
    if condition3
      % statements
      % increment counter
      break; % Breaks out of inner while loop only, loop #2.
    else
      % Here i want to break out without return to any while
      again = false;  % Make sure outer while loop does not iterate again.
      break;
    end
    % Increment counter

    loopCounter2 = loopCounter2 + 1;
  end
  % Increment counter
  loopCounter1 = loopCounter1 + 1;
end

Related Solutions

MATLAB: Need helping finding the source of the forever loop in the code

Usually when there is an infinite loop it's with a while loop that never met the condition to exit, and (importantly!) didn't have a failsafe. Your while loops do not have a failsafe to prevent an infinite loop, as all while loops should have. Let's say that you know the while loop should iterate about 1000 times, and that if it goes over 50,000, something's definitely wrong. So you must have a loop counter and a check that the loop counter does not exceed your max iteration count. Modify your loops to add a failsafe like this:

maxIterations = 50000; % Some big number that you know should never be reached.
loopCounter = 1;
while someCondition && loopCounter <= maxIterations
    fprintf('Starting iteration #%d.\n', loopCounter);
    % Some code to generate a new value for someCondition.
    % Increment the loop counter:
    loopCounter = loopCounter + 1;
end
if loopCounter >= maxIterations
    warningMessage = sprintf('Loop terminated early after %d iterations', loopCounter - 1);
    uiwait(warndlg(warningMessage));
end

Now, after you've made those modifications, what do you see? It should kick out after it hits the max iteration number. Does it? Why? You should check the condition for when the two loops you have should exit. Are they ever met?

MATLAB: Running two while loops

As a general form you can use something like

need_to_repeat_outer_loop = true;
while need_to_repeat_outer_loop
    %some code








    need_to_repeat_inner_loop = true;
    while need_to_repeat_inner_loop
        %some code
        if some inner condition
            need_to_repeat_inner_loop = false;
        end
    end
    %some code
    if some outer condition
        need_to_repeat_outer_loop = false;
    end
end

Hower, in practice most of the time you would instead write

while true
    %some code
    while true
        %some code
        if some inner condition
            break;   %out of inner loop

        end
    end
    %some code
    if some outer condition
        break;
    end
end

Sometimes you are inside the inner loop and need to signal that the outer loop is to be stopped. For that you can use

while true
    %some code
    while true
        stop_outer = false;
        %some code
        if some inner condition
            stop_outer = true;
            break;   %out of inner loop
        end
    end
    if stop_outer;
        break;
    end
    %some code
end

Best Answer

Related Solutions

MATLAB: Need helping finding the source of the forever loop in the code

MATLAB: Running two while loops

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