说明：  matlab 画填充条形图，一般matlab 画出的条形图只有颜色区别，打印出来后所有颜色没有任何区别，填充条形图打印出来后仍然可以区分。
(Matlab painting filled bar graph, the general matlab drawing of the bar graph only color difference, print out all the color without any difference, fill the bar chart print out can still be distinguished.)