MATLAB Answers


multi bar labeling plot

Asked by Ali Ali on 16 May 2019
Latest activity Commented on by Ali Ali on 20 May 2019
I want to label each three bars as p1, p2 and p3 for all at the base as the pic attached.. i appreciate any help someone can provide.


Wouldn't a legend defining the colors make more sense?
you are right.. but i'll manopolate with the colors later.. so it will not be fixed as it now.

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2 Answers

Answer by Adam Danz
on 16 May 2019
Edited by Adam Danz
on 16 May 2019
 Accepted Answer

Here's how to locate the center of each grouped bar and label them. It uses an undocumented property "XOffset". This was developed and tested in r2019a.
xCnt are the bar centers.
% Generate grouped bar plot
v = randi(20,12,3);
h = bar(v,.8);
% Get group centers
xCnt = get(h(1),'XData') + cell2mat(get(h,'XOffset')); % XOffset is undocumented!
% Create Tick Labels
xLab = repmat({'p1','p2','p3'},1,numel(xCnt)/3);
% Set individual ticks
set(gca, 'XTick', sort(xCnt(:)), 'XTickLabel', xLab)
Alternatively, you could rotate the x tick labels
set(gca, 'XTick', sort(xCnt(:)), 'XTickLabel', xLab, 'xticklabelrotation', 90)
% Or use xtickangle():
The best solution would be to use a legend


like below if you can Adam
% xLab are the labels for each individual bar. The pattern you want is the following:
% for every odd triplet, you want [nothing, #, nothing]
% and for every even triplet you want [p#, p#, p#].
% We already have the p# labels so we just need to alter the odd number groups.
% Step 1) Identify the odd number groups.
isOdd = repmat(logical([1,1,1,0,0,0]),1,length(xLab)/6);
% Step 2) Create new labels
newLabs = strsplit(sprintf('| |%d| |', 1:2:length(xLab)/3),'|');
newLabs(cellfun(@isempty, newLabs)) = [];
% Step 3) replace the p# labels for odd groups with [nothing, #, nothing]
xLab(isOdd) = newLabs;
% Step 4) assing newlabels to plot
set(gca, 'XTick', sort(xCnt(:)), 'XTickLabel', xLab, 'xticklabelrotation', 90)
thank you a lot Adam.. this is realy helped me.

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Answer by Sulaymon Eshkabilov on 16 May 2019

Hi Ali,
Here is a simple solution to your problem:
A= randi([15, 25], 13, 3); % Insert your data here
H = bar(A); shg
Good luck.


How does that solve his problem?
Sulaymon Eshkabilov i think you did not get my point.. anyway thank you for your help.

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