matlab--离散（discrete）数据绘图
x=[a,b]：x的取值从a到b，默认增量为1x=[1:5];y=[50,98,75,80,98];plot(x,y,'o',x,y),set(gca,'XTicklabel',['001';'002';'003';'004';'005']),...set(gca,'xtick',[1:5]),axis([1 5 0 100]),xlabel('student'),...ylabel('final test score'),title('final exam december 2005')
