screen=get(0,'screensize');
winw=screen(3);winh=screen(4);

windface=figure('color',[0.9 0.9 0.9],'position',[0.2*winw,0.2*winh,0.6*winw,0.6*winh],...
       'name','《采樣控制系統的MATLAB仿真》','numbertitle','off','menubar','none',...
        'resize','on');