%例如令a=2
a=2;
x=[0.5 1 1 5 5 8 8 9 9 11 11 13 13 14 14 15 15 16 16 20];
x_0=0:25;
y_0=zeros(1,26);
y=[-a -a a a -a -a a a -a -a a a -a -a a a -a -a a a ];
plot(x,y,x_0,y_0)
text(1.1,-0.18,'1');
text(5.1,-0.18,'5');
text(10.1,-0.18,'10');
text(15.1,-0.18,'15');
axis([0,25,-2*a,2*a])
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