CloseFunc

global N;
global axiom;
    switch questdlg('Save variables or clear them?', ...
                         'Close', ...
                         'Save', 'Clear', 'Clear');
    case 'Save' 
        save vars N axiom;
        closereq
    case 'Clear'
        clear global N;
        clear global axiom;
        clear ButtonName;
        closereq
end