Help with Errorbars on Bar Graph

I created a bar graph using the following:

AngleFlex90 = [95 99; 93.33 80; 95.67 99.33]; AngleError = [8.9 6.6; 7.6 5; 4 1.2]; bar(AngleFlex90, 'grouped') set(gca, 'XTicklabel',{'Subject 1' 'Subject 2' 'Subject 3'})

hold on title('Elbow Flexion Angle for 3 Subjects with a Goal of 90 Degrees','FontSize',14, "FontWeight","bold") xlabel('Subject','FontSize',12, "FontWeight","bold") ylabel('Elbow Angle (deg)','FontSize',12, "FontWeight","bold") legend('Baseline','Experimental',"Location","northeast") ylim([0 130]) yline (90)

errorbar(AngleFlex90,AngleError,'k', "LineStyle",'none', "LineWidth",1);

The figure that came up had errorbars between each set of bars rather than in the centre of them. How do I code to have the errorbars in the centre of each bar?

I tried using ngroups and nbars codes that I found on the internet but non of them made sense to me because I’ve never coded until recently.

Thanks for any help you can give.

[Jordyn Shaw]

This is what I get using the current code but I need to centre my individual errorbars.

Answer 1

[Star Strider]

Try this:

AngleFlex90 = [95 99; 93.33 80; 95.67 99.33]; 
AngleError = [8.9 6.6; 7.6 5; 4 1.2].'; 

figure
hBar = bar(AngleFlex90, 'grouped'); 
set(gca, 'XTicklabel',{'Subject 1' 'Subject 2' 'Subject 3'})
hold on 
for k1 = 1:size(AngleFlex90,2)
    ctr(k1,:) = bsxfun(@plus, 1:numel(hBar(k1).XData), hBar(k1).XOffset');  % Note: ‘XOffset’ Is An Undocumented Feature, This Selects The ‘bar’ Centres
    ydt(k1,:) = hBar(k1).YData;                                             % Individual Bar Heights
end
errorbar(ctr, ydt, AngleError,'.');
title('Elbow Flexion Angle for 3 Subjects with a Goal of 90 Degrees','FontSize',14, "FontWeight","bold") 
xlabel('Subject','FontSize',12, "FontWeight","bold") 
ylabel('Elbow Angle (deg)','FontSize',12, "FontWeight","bold") 
yln = yline (90);
legend(hBar,'Baseline','Experimental', "Location","northeast") 
ylim([0 130]) 

producing:

.

[Jordyn Shaw]

Amazing! Thank you so much!

[Star Strider]

As always, my pleasure!