flag_selected = select_load_file() Asks whether the user wants to load a .mat or a .txt file, and then calls whether select_load_mat_file() or select_load_txt_file() Returns: flag_selected: 0 - no file was selected; 1 - a file was selected global IDEXPERIMENT EXPERIMENT_NAME NO_WAVENUMBERS IDJUDGE_REF CLASS_LABELS DATA