How do I label the bars in my histogram with the function "histogram" ?

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Sim 2022-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/1751935-how-do-i-label-the-bars-in-my-histogram-with-the-function-histogram

评论： Voss 2022-7-3

In a similar thread a user asked: How do I label the bars in my histogram?

However, that person mentioned the function hist, instead of the function histogram, and the solution proposed by @MathWorks Support Team was therefore based on the function hist:

% Create random data for the sake of the example
data = 10*rand(1,100);
% Draw the histogram
hist(data);
% Get information about the same 
% histogram by returning arguments
[n,x] = hist(data);
% Create strings for each bar count
barstrings = num2str(n');
% Create text objects at each location
text(x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')

Now, how do I label my bars but using the function histogram instead of hist ?

Indeed, the function histogram has not "counts" and "centers" as the function hist:

[counts,centers] = hist(___)

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Answer 1

Voss 2022-7-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1751935-how-do-i-label-the-bars-in-my-histogram-with-the-function-histogram#answer_998200

编辑：Voss 2022-7-1

在 MATLAB Online 中打开

% Create random data for the sake of the example

data = 10*rand(1,100);

% Draw the histogram and return histogram object

h = histogram(data);

% Get information about the histogram

edges = get(h,'BinEdges');

n = get(h,'Values');

% Create strings for each bar count

barstrings = num2str(n');

% Create text objects at each location

x = (edges(1:end-1)+edges(2:end))/2;

text(x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')

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Voss 2022-7-1

在 MATLAB Online 中打开

Using num2str(n') to create a 2D character array of text labels can give you labels with spaces in them, which won't appear exactly centered on the bars.

To take an extreme case:

% Create random data for the sake of the example
data = 5*rand(1,11000);
% Make the majority of the data end up in a single bin
data(1:10000) = 0;
% Set up subplots for comparison of two approaches below
figure();
ax = [subplot(2,1,1) subplot(2,1,2)];

Case 1: Using num2str(n'):

% Draw the histogram and return histogram object
% (specifying number of bins = 20)
h = histogram(ax(1),data,20);
% Get information about the histogram
edges = get(h,'BinEdges');
n = get(h,'Values');
% Create strings for each bar count using num2str()
barstrings = num2str(n');
% Create text objects at each location
x = (edges(1:end-1)+edges(2:end))/2;
text(ax(1),x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')

Case 2: Using sprintfc('%d',n):

% Draw the histogram and return histogram object

% (specifying number of bins = 20)

h = histogram(ax(2),data,20);

% Get information about the histogram

edges = get(h,'BinEdges');

n = get(h,'Values');

% Create strings for each bar count using sprintfc()

barstrings = sprintfc('%d',n);

% % Alternative: Create strings for each bar count using strtrim(cellstr(num2str()))

% barstrings = strtrim(cellstr(num2str(n')))

% Create text objects at each location

x = (edges(1:end-1)+edges(2:end))/2;

text(ax(2),x,n,barstrings,'horizontalalignment','center','verticalalignment','bottom')

% Use log y-scale to see the bars better in this case

% (doesn't affect the horizontal spacing of text labels)

set(ax,'YScale','log')

% Title the plots

title(ax(1),'extra spaces')

title(ax(2),'no extra spaces')

Sim 2022-7-3

Thanks a lot @Voss!! Cool answer!! :-)

Voss 2022-7-3

Thank you, and you're welcome!

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How do I label the bars in my histogram with the function "histogram" ?

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