Thank you.
Wendy
one of the many solutions
x=rand(1,3);
xd={'jun','jul','aug'};
nx=numel(x);
bar(x);
set(gca,'ylim',[0,1.2],'xticklabel',xd);
text(1:nx,repmat(1.1,1,nx),xd,...
'horizontalalignment','center',...
'fontsize',12,...
'fontweight','bold');
us