Horizontal line in categorical bar plot?

Hello,

I'm trying to put a horizontal line in a bar plot. So far, this is what I've got:

As you can see, the line does not go from one end to the other of the graph. I guess it's because I have a categorical plot. Here's my code :

    bar(Niveaux,Result.Moyennes(:,j), 'FaceColor',[0.847 0.835 0.835], 'EdgeColor',[0.847 0.835 0.835]); hold on; 
    ylim([0 40]);
    xlim=get(gca,'xlim');
    plot(xlim,[20 20], 'r', 'LineWidth',2); hold on;
    plot(xlim,[29 29], 'k', 'LineWidth',2); hold on;
    plot(xlim,[38 38], 'g', 'LineWidth',2);

Any idea?

Thank you for your help

Answer 1

[Fred Sallabank]

Yes, I think it is because you have a catergorial plot. When you put it in a string instead and specify the Xtick is seems to work.

%INPUTS
    Data = [20;50;30];
    Bounds = [25;55;35];
    string = ["A","B","C"];
    
    figure
    bar(Data)
    set(gca, 'XTickLabel',string, 'XTick',1:numel(string))
    hold on
    
    %Specify coordinates of lines
    x = xlim;
    y1 = [Bounds(1),Bounds(1)];
    y2 = [Bounds(2),Bounds(2)];
    y3 = [Bounds(3),Bounds(3)];
    
    plot(x,y1,'b', x,y2,'g', x,y3,'r','LineWidth',2)
    hold off

If you have to keep it catergorial I could only suggest altering the x cordinates of the lines manually, for instance:

xlim = get(gca,'xlim');
xlim = [xlim(1)-0.05, xlim(2)+0.05];