function varargout = GUI_exam1(varargin)global handlesif nargin == 0  	fig = openfig(mfilename,'reuse');	set(fig,'Color',get(0,'defaultUicontrolBackgroundColor'));    set(fig,'Name','GUIDE環境編程實例：繪制圖形y=sin(x)^3')	handles = guihandles(fig);	guidata(fig, handles);	if nargout > 0		varargout{1} = fig;	endelseif ischar(varargin{1}) 	try		if (nargout)			[varargout{1:nargout}] = feval(varargin{:}); 		else			feval(varargin{:}); 		end	catch		disp(lasterr);	endend% --------------------------------------------------------------------function varargout = pushbutton_plot_Callback(h, eventdata, handles, varargin)x=0:pi/30:2*pi;y=sin(x).^3;axes(handles.axes_plot)                % 通過axes(handles.axes_plot)語句，指定坐標軸繪圖plot(x,y)axis([0 2*pi -1.2 1.2])% --------------------------------------------------------------------function varargout = pushbutton_grid_Callback(h, eventdata, handles, varargin)a=get(handles.pushbutton_grid,'String');     % 通過訪問句柄pushbutton_grid獲取其Sting屬性switch acase 'grid on'                       % 如果String為grid on，則在原圖的基礎上畫出網格線    axes(handles.axes_plot)          % 指定坐標軸axes_plot    grid on                        % 添加網絡線    set(handles.pushbutton_grid,'String','grid off');      % 通過訪問句柄pushbutton_grid                                               % 重新設置其Sting屬性為grid off case 'grid off'                       % 如果String為grid off，則取消網格線    axes(handles.axes_plot)           % 指定坐標軸axes_plot    grid off                        % 取消網絡線    set(handles.pushbutton_grid,'String','grid on')       % 通過訪問句柄pushbutton_grid                                               % 重新設置其Sting屬性為grid on end% --------------------------------------------------------------------function varargout = pushbutton_exit_Callback(h, eventdata, handles, varargin)ss=questdlg('確定退出嗎？','感謝您的使用',...    '是的,我不用了','不,我想再看看','是的,不用了');  % 調用詢問對話框switch ss,                                                   case '是的,我不用了',             % 用戶若選擇退出，則結束運行程序    delete(handles.figure1);end