MATLAB: List of lists while loop

arrayhomeworklist of listsMATLABwhile

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No need for a cell array if feathers is a number (not a string). You need to index the array_of_ducks array however. You can do that with an iteration counter:

ducks = 1
additional_ducks = 0.5
loopCounter = 1;
maxIterations = 10000; % Whatever you don't expect to ever exceed.  A failsafe to prevent infinite loops.
while ducks <= 3 && loopCounter < maxIterations 
    feathers = (math here)
    ducks = ducks + additional_ducks;
    array_of_ducks(loopCounter) = feathers; % No braces needed.
    loopCounter = loopCounter + 1; % Increment loop counter.
end

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MATLAB: Exit code from program

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

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?

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MATLAB: Exit code from program

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

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