Try this:
numIterations = 1;
maxIterations = 20;
while numIterations < maxIterations
% Run your code now....
% Now ask user if they want to run it again.
promptMessage = sprintf('Do you want to process again,\nor Quit processing?');
titleBarCaption = 'Continue?';
buttonText = questdlg(promptMessage, titleBarCaption, 'Process Again', 'Quit', 'Process Again');
if contains(buttonText, 'Quit')
break; % Break out of the while loop.
end
numIterations = numIterations + 1;
end
