MATLAB: Looping over folders, skipping a folder if a file is present

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I have code that executes a for loop through a folder and all of its subdirectories. My questions is how do I write the code in order to :
A.) check if a file is present within the folder in the for loop, and then
B.) skip that folder containing the file IF the file is present.
Here is the code i have been fumbling with so far:
mainFolder = 'c:\data';
subdirs = dir(mainFolder);
%This filters out all the items in the main folder that are not directories
subdirs(~[subdirs.isdir]) = [];
%And this filters out the parent and current directory '.' and '..'
tf = ismember( {subdirs.name}, {'.', '..'});
subdirs(tf) = [];
numberOfFolders = length(subdirs);
% %Here i am creating the variables to iterate over the date folders
% dates = fieldnames(subdirs);
% for loopIndex = 1:numel(dates)
%     stuff = subdirs.(dates{loopIndex})
% end
% Here I begin the for loop.  My aim is to tell the program to skip all %the folders that contain the file "Present.txt"
for K = 1: numberOfFolders
thissubdir = subdirs(K).name;
subdirpath = [mainFolder '\' thissubdir];
%This is WRONG WRONG WRONG... help please?
  if exist('Present.txt') == 1
      continue
  end
Thanks for all the help!

Best Answer

Since you aren't calling cd for every subdir (that's good by the way), you need to construct the full file name.
fullfileName = fullfile(subdirpath, 'Present.txt');
if exist(fullfileName , 'file') == 2
  % Then the file exists, skip the rest of the code in the loop.
  continue
end
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