MATLAB: How to label multiple bars within the same x-value

barlabel;MATLABplot

Hej im trying to create a plot of some testvalues, and i simply cant figure out a way to label multiple bars within the same x-value.
The test data comes out in a 6 x M matrix telling the time datacollection time and a 4 x M matrix with the testdata were each column is zone1, zone2, zone3 and zone4.
i've tried this so far: 
Zones={'zone1','zone2','zone3','zone4'};
          X=tvec_a(:,4);
          Y=data_a;
          bar(X,Y,1)
          set(gca,'xticklabel',Zones)
          title('Hourly consumption')
          xlabel('Hour') 
          ylabel('Consumption')
But this simply output all four columns with the same same instead of each column was devided into zones for each x-val:

Best Answer

After a whole lot of research, I've found nothing that solves that excact problem. Allthough I ended up finding two solutions wich solves the issue of telling the individual bars from oneanother:
1) using legend: 
b=bar(tvec_a(:,N),data_a,1);
        title(name)
        xlabel(X) 
        ylabel('Consumption')
        axis([-inf inf -inf inf])
        legend({'zone 1','zone 2', 'zone 3', 'zone 4'},'Location','northwest')
        grid on
2) using bar labels
        b=bar(tvec_a(:,N),data_a,1);
        title(name)
        xlabel(X) 
        ylabel('Consumption')
        xtips1 = b(1).XEndPoints;
        ytips1 = b(1).YEndPoints;
        labels1 = 'z_1';
        text(xtips1,ytips1,labels1,'HorizontalAlignment','center',...
            'VerticalAlignment','top','color','w')
        xtips2 = b(2).XEndPoints;
        ytips2 = b(2).YEndPoints;
        labels2 = 'z_2';
        text(xtips2,ytips2,labels2,'HorizontalAlignment','center',...
            'VerticalAlignment','top','color','w')
        xtips3 = b(3).XEndPoints;
        ytips3 = b(3).YEndPoints;
        labels3 = 'z_2';
        text(xtips3,ytips3,labels3,'HorizontalAlignment','center',...
            'VerticalAlignment','top','color','w')
        xtips4 = b(4).XEndPoints;
        ytips4 = b(4).YEndPoints;
        labels4 = 'z_2';
        text(xtips4,ytips4,labels4,'HorizontalAlignment','center',...
            'VerticalAlignment','top','color','w')
        axis([-inf inf -inf inf])
        grid on
I personally thinks the legend is the better sollution
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