You can get the file information (name, folder, date, ...) of files within subfolders using the dir command and wildcards. e.g. if your are in the folder which contains the #gm folders then the command
files = dir('./*/*/*.out');
will return a struct of all *.out files within all the second level subfolders. You can then easily build a cell arrray of filenames and operate on them using cellfun:
filePaths = fullfile({files(:).folder},{files(:).name});
cellfun(@(x) disp(x),filePaths,'UniformOutput',false); % substitute disp by your function and add a return value to have catch your functions output in a cell
