Plotting histogram with percentage

2020 7 6
1 个回答
更新时间：2020 7 8
8 次查看（30 天）

0 个投票

Hi all,
Recently I had a csv that I want to import by
T = readtable('1.csv');
and plot by histogram
Any chance to display this histogram with indivudual percentage over each bar?
Class; Value; Class start; Class end;
1;8410;-0.039916738868;-0.032423677233;
2;78271;-0.032423677233;-0.024930615599;
3;501926;-0.024930615599;-0.017437553965;
4;149453;-0.017437553965;-0.009944492330;
5;342924;-0.009944492330;-0.002451430696;
6;546900;-0.002451430696;0.005041630939;
7;537726;0.005041630939;0.012534692573;
8;527320;0.012534692573;0.020027754207;
9;478488;0.020027754207;0.027520815842;
10;345973;0.027520815842;0.035013877476;
11;276272;0.035013877476;0.042506939111;
12;694253;0.042506939111;0.050000000745;

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回答（1 个）

Rik
Rik 2020-7-6

0 个投票

You will have to insert those labels with the text function.

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Thinkboard
Thinkboard 2020-7-7
Any chance to annotate t automaticaally?
Rik
Rik 2020-7-7
If that would be possible it would be in the documentation. So, no.
If you have trouble implementing it, feel free to post a comment with what you tried.
Adam Danz
Adam Danz 2020-7-8
Now all you need are the x-values that define the center of each bar and the y values that define the height of each bar.
xCenters = h.BinEdges(1:end-1) + h.BinWidth/2;
yHeights = h.Values;
Then calculate the percentages
percentages = .... % I'll leave that up to you.
% There needs to be n values where n is the number of bars.
Convert the percentages to strings with 1 decimal place
percentageStrings = compose('%.1f',percentages*100);
Then label the peaks
text(xCenters,yHeights,percentageStrings,...
'HorizontalAlignment','center','VerticalAlignment','middle', ...
'FontSize', 8);
Thinkboard
Thinkboard 2020-7-8
Hi Rik,
I've found a useful code here on data exchange.
But my main graph is using bar(X,Y) plot instead of historgram, how can i make use of percent generate from "Histogram Percentage function" to add it on my bar chart?
clear;
close all;
Array=csvread('1.csv',1,0);
Value = Array(:,2);
CStart = Array(:,3);
CEnd = Array(:,4);
edges = transpose(CStart);
figure;
subplot(2,1,1);
bar(edges,Value)
title('Histogram');
xlabel('Distnce');
ylabel('Count');
subplot(2,1,2);
histogramPercentage(Value);
title('Histogram Percentage')
xlabel('Values');
ylabel('Number of Observations');
Rik
Rik 2020-7-8
You can either use the code Adam suggested, or look into what that function from the FEX is actually doing:
function histogramPercentage(x,fontSize)
h = histogram(x,'Visible', 'off');
[nelements,centers]= hist(x,h.NumBins);
percantages = 100 * nelements / sum(nelements);
bar(centers,nelements,'Facecolor',[0.4,0.7,0.9],'BarWidth',1);
for k = 1:numel(centers)
if percantages(k) ~= 0
text(centers(k),nelements(k),[sprintf('%.f',(percantages(k))) '%'],'HorizontalAlignment','center','VerticalAlignment','bottom','FontSize',fontSize);
end
end
So in short: you need the bin centers and the height. Then you can easily create the text objects in a loop.

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