How to add text in a bar in a multiple bar plot?

Hi all,

I have a matrix M like this:

 M = [99.0000   93.0000   65.0000   95.0000   97.0000   97.0000;
    84.0000   95.0000   79.0000   83.0000   92.0000   92.0000;
    91.0000   89.0000   74.0000   93.0000   75.0000   81.0000;
    93.0000   88.0000   93.0000   97.0000   89.0000   91.0000;
    76.0000   80.0000   71.0000   80.0000   71.0000   80.0000;
    80.0000   70.0000   35.0000   53.0000   71.0000   73.0000;
    92.5197   91.7485   73.3855   90.6445   90.2386   91.9565]

and when I plot it I obtain this

hb = bar(percentageMatrixEC);

I would like to add on each bar a number, this numbers:

numbersToAdd = [162 162 162 148 150 156;
                101 101 101  96  86  75;
                 75  75  75  72  70  71;
                 58  58  58  58  53  56;
                 21  21  21  20  17  20;
                 20  20  20  19  17  15;
                512 512 512 482 462 461]

I would like something like this:

I was looking in MATLAB help but I couldn't find anything for bars with multiple groups.

If you can help me I will really appreciate it!

Cheers!

[José-Luis]

Where would you like those numbers to appear? You have 6x7 bars but only 6x6 numbers.

[German Preciat Gonzalez]

true, thanks, fixed

[José-Luis]

You still haven't said where you want those numbers to appear.

[Star Strider]

It would help to know the MATLAB version you’re using. The solution is different for R2014b and later releases than for prior versions.

Answer 1

[José-Luis]

   M = [99.0000   93.0000   65.0000   95.0000   97.0000   97.0000;
      84.0000   95.0000   79.0000   83.0000   92.0000   92.0000;
      91.0000   89.0000   74.0000   93.0000   75.0000   81.0000;
      93.0000   88.0000   93.0000   97.0000   89.0000   91.0000;
      76.0000   80.0000   71.0000   80.0000   71.0000   80.0000;
      80.0000   70.0000   35.0000   53.0000   71.0000   73.0000;
      92.5197   91.7485   73.3855   90.6445   90.2386   91.9565];

hb = bar(M);

numbersToAdd = [162 162 162 148 150 156;
                101 101 101  96  86  75;
                 75  75  75  72  70  71;
                 58  58  58  58  53  56;
                 21  21  21  20  17  20;
                 20  20  20  19  17  15;
                512 512 512 482 462 461];

barWidth = hb.BarWidth;
numCol = size(M,2);

cnt = 0;
for ii = numbersToAdd'
    cnt = cnt + 1;
    xPos = linspace(cnt - barWidth/2, cnt + barWidth / 2, numCol+1);
    idx = 1;
    for jj = xPos(1:end-1)
        val = numbersToAdd(cnt,idx);
        y = M(cnt,idx);
        text(jj, y + 1, num2str(val));
        idx = idx +1;
    end     
end

[German Preciat Gonzalez]

Merci

[ammara khurshid]

Hello! i was in search of the same concept and this helped me. i need a bit change in this code"i want to write text like 'A', 'B', 'c' etc. at the top of the each bar of each group. help kindly.

Answer 2

[Brendan Hamm]

This requires us to find information about the location of each of the individual bars and calculate the centers for the labels. This can be done with the bar property BarWidth. I found it easiest to find the left edge of the set of bars and add an offset at each iteration. I wrote a helper function for the offset and text creation and call it in a for loop.

hb = bar(M);
% Make Left bars first in list so that the kth bar is made up of the kth
% column of data.
hb = flipud(hb); 

% Number of XAxisValues:
numXVals = numel(hb);

% Find the width of a bar
dx = hb(1).BarWidth/numXVals;
% Find the Left Most Edge of each X Values bars
leftEdge = hb(1).XData - hb(1).BarWidth/2;
% Adjust to center of left bar
leftEdge = leftEdge + dx/2;

for k = 1:numXVals
    labelBar(hb(k),dx,leftEdge,k,numbersToAdd(:,k))
end

function labelBar(hb,dx,leftEdge,k,lbl)

      % YData Location
      yLoc = hb.YData;

      % Adjust offset from left edge of bars
      xLoc = leftEdge + (k-1)*dx; % Find position from Left Edge

      txt = num2str(lbl);
      text(xLoc,yLoc,txt,...
          'HorizontalAlignment','center',...
          'VerticalAlignment','bottom');
  end