t1=(0:11)/11*pi;														%	<1>
y1=sin(t1).*sin(9*t1);
t2=(0:100)/100*pi;													%	<3>
y2=sin(t2).*sin(9*t2);
subplot(2,2,1),plot(t1,y1,'r.'),axis([0,pi,-1,1]),title('子圖 (1)')
subplot(2,2,2),plot(t2,y2,'r.'),axis([0,pi,-1,1]),title('子圖 (2)')
subplot(2,2,3),plot(t1,y1,t1,y1,'r.')
axis([0,pi,-1,1]),title('子圖 (3)')
subplot(2,2,4),plot(t2,y2)
axis([0,pi,-1,1]),title('子圖 (4)')