目标是绘制以下的柱状图：

 代码：

state_x=[hunx;suix;kongx]';
xx=[6,8,10,12,14,16];
figure
bar(xx,state_x);
for i=1:length(hunx)text(xx(i)-0.5,state_x(i,1),num2str(state_x(i,1)),'HorizontalAlignment','center','VerticalAlignment','bottom');text(xx(i),state_x(i,2),num2str(state_x(i,2)),'HorizontalAlignment','center','VerticalAlignment','bottom');text(xx(i)+0.5,state_x(i,3),num2str(state_x(i,3)),'HorizontalAlignment','center','VerticalAlignment','bottom');
end
xticklabels({'6','8','10','12','14','16'});
ylim([0,900]);
set(gca,'fontsize',13);
xlabel('转速(rpm)','FontSize',15);  ylabel('频率(Hz)','FontSize',15);

其中：state_x的数据为6*3矩阵

 解释下循环中的程序：text(xx(i)-0.5,state_x(i,1),num2str(state_x(i,1)),'HorizontalAlignment','center','VerticalAlignment','bottom');

%  xx(i)-0.5,state_x(i,1)表示为所要标注的位置，一个为横轴上的，一个为纵轴上的；

%  num2str(state_x(i,1))表示所要标注的数值；