How to label stacked bar?

Hi,

I have a stacked bar that I would like to label, but it is turning out more frustrating than I thought. I basically want to label each portion of the stacked bars.

It is an 11 by 5 matrix of the distance covered by each footballer while walking, jogging, running, high-speed running and sprinting.

The basics of the code that I use is as follows, and a sample of the stacked bar is shown in the picture

    figure; bar(rand(11,5), 'stacked'); 
    set(hText, 'VerticalAlignment','bottom', 'HorizontalAlignment', 'center','FontSize',16, 'Color','k');
    hLegend = legend(bar(Belgium_TimeMotion_ascending(:,1:5), 'stacked'), {'Walking (<2m/s)','Jogging (2 to 4m/s)','Running (4 to 5.5m/s)','High-speed running (5.5 to 7m/s)','Sprinting (>7m/s)'});
    set(hLegend, 'Location','Best','FontSize',10);
    legend('boxoff');

Is there a syntax I can use to

1. label the portions of the stacked bars?
2. set a conditional statement not to display any zero values (e.g. player 1 did not do any high-speed running or sprinting, so figure does not need to display "zero" two times.

Any help is appreciated. Thank you!

[Rik]

Have a look how to correctly format your code here (in the answers there is also an animated gif).

If you want to label all bar parts, can't you use the text function? It is tricky to get it to look nice, especially with a scaling figure, but it sounds closest to what you want.

[Benedict Low]

Hi Rik, thank you for your advice, I have tried the text function but I have one minor problem, as seen in the picture, the zero values overlapped with some of the preceding values.(the topmost white text)

The additional code I've written is

labels_stacked=num2str(sample_data(:,1),'%.1f m');
hText = text(1:size(sample_data), sample_data(:,1), labels_stacked);

% Repeated 5 times for an 11 by 5 matrix
labels_stacked=num2str(sample_data(:,2),'%.1f m');
hText = text(1:size(sample_data), sum(sample_data(:,1:2),2), labels_stacked);

labels_stacked=num2str(sample_data(:,3),'%.1f m');
hText = text(1:size(sample_data), sum(sample_data(:,1:3),2), labels_stacked);

labels_stacked=num2str(sample_data(:,4),'%.1f m');
hText = text(1:size(sample_data), sum(sample_data(:,1:4),2), labels_stacked);

labels_stacked=num2str(sample_data(:,5),'%.1f m');
hText = text(1:size(sample_data), sum(sample_data(:,1:5),2), labels_stacked);

Is there a conditional statement for the text function not to display if some elements of the matrix have zero value?

Any help is appreciated. Thank you.

Answer 1

[Rik]

I did not test this code, but it should skip the 0 values

hText=zeros(1,size(sample_data,2));
for n=1:size(sample_data,2)
    labels_stacked=num2str(sample_data(:,n),'%.1f m');
    textheight=sum(sample_data(:,1:n),2);
    text_x=1:size(sample_data);
    non_zero=sample_data(:,n)~=0;
    hText(n) = text(text_x(non_zero), textheight(non_zero), labels_stacked(non_zero,:));
end

Are you planning to do something with hText? If so, you should think about making a vector/matrix of handles.

[Benedict Low]

Hi Rik,

Unfortunately, the labels won't display. The error message I got is "Cell contents reference from a non-cell array object."

I'm using hText because later on I'm using the "set" function to adjust things like the alignment, font size and so on...

[Rik]

I wrongly assumed labels_stacked to be a cell, so I'll edit my answer.

[Benedict Low]

Hi Rik,

Thanks for your response. I've edited it a little and basically found a way to do a number to string conversion, only if an element of an array is >0

% Sample 5 by 5 data
sample_data=[3 5 3 3 3; 2 8 2 2 0; 1 1 1 0 0; 2 2 0 0 0; 7 3 2 4 0];

% Plotting a stacked bar chart
figure; bar(sample_data, 'stacked'); 

% A loop that does num2str conversion only if value is >0
for i=1:size(sample_data,1);
    for j=1:size(sample_data,2);
        if sample_data(i,j)>0;
        labels_stacked=num2str(sample_data(i,j),'%.1f m');
        hText = text(i, sum(sample_data(i,1:j),2), labels_stacked);
        set(hText, 'VerticalAlignment','top', 'HorizontalAlignment', 'center','FontSize',10, 'Color','w');
        end
    end
end

The resulting plot is as follows.

Thanks for all your help!

Best regards,

Ben