allEditors = matlab.desktop.editor.getAll;
Now match the filename you want to close against {allEditors.Filename} to figure out the index of the session you want to close. For example,
filenames = regexp({allEditors.Filename}, '[^/\\]+$', 'match','once');
[found, idx] = ismember(FilenameToClose, filenames);
if found
allEditors(idx).close();
end
Except that you need to be more careful than this because there can be multiple files with the same last part of the file name, distinguished by directory.
