How to show the bin' percentage values' in a histogram?

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Maria Amr 2021-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/762411-how-to-show-the-bin-percentage-values-in-a-histogram

回答： Maria Amr 2021-3-4

A.xlsx

Mukul Rao, I am really new in MATLAB and I would appreciate if direct me about this rodimentary question. I want to show the bin counts "percentage values" in histogram and my code is below but something is wrong and I can not find it!! Thank you n advance!

clc;
clear all;
close all;
%.................................................
data=xlsread('A');
dens=data(:,1);%gr/cm3
x=dens(1:1:end);
hist(x,24);
binranges = -0.06:0.08;
[bincounts] = histc(x,binranges);
percentagevalues = bincounts./sum(bincounts) * 100;
figure(2)
bar(binranges,bincounts,'histc')
for i = 1:length(bincounts)-1
    x = (binranges(i) + binranges(i+1))/2;
    y = bincounts(i)+1;
    text(x,y,num2str(bincounts(i),'%3.2f'),'HorizontalAlignment','center');
end

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Maria Amr 2021-3-4

编辑：Maria Amr 2021-3-4

Cris LaPierre, Thank you!I am working with an old version 2013a but I hav run it in a 2020a as well and it does not show the figure 2 as well. The figure(2) should show final results.

Maria Amr 2021-3-4

Cris LaPierre It is not working in any version! and I can not fine the issue!

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Answer 1

Cris LaPierre 2021-3-4

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The issue is with how you defined your binranges. When you don't specify a step size, the colon operator uses 1.

binranges = -0.06:0.08
binranges = -0.0600

Since bin edges must contain at least 2 values, the result of histc is bincounts=0. Run your code with your desired stepsize and it will work.

binranges = -0.06:0.01:0.08
binranges = 1×15
   -0.0600   -0.0500   -0.0400   -0.0300   -0.0200   -0.0100         0    0.0100    0.0200    0.0300    0.0400    0.0500    0.0600    0.0700    0.0800