Hi Alyse,
Can you try something similar to this?
FileList = dir('*.txt');
[~,idx] = sort([FileList.datenum]);
FileData = [];
for iFile = 1:numel(idx)
currFile = FileList(idx(iFile)).name;
FileData.(['file_' num2str(iFile)]) = load(currFile);
end
Make sure your current directory is your .txt files are located.
Thanks,
Nikhil