x=-pi/2:0.001:8*pi;y1=1/2*(cos(x)+abs(cos(x)));y2=abs(sin(x)+1/2);plot(x,y1,'r*',x,y2,'b-');legend('y=1/2(cosx+|cosx|)','y=|sinx+1/2|');周期应该不用我说也看出来了吧...