How to display the actual values of my percentages on a pie chart

Question

LeoAiE 2021-4-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/808177-how-to-display-the-actual-values-of-my-percentages-on-a-pie-chart

评论： LeoAiE 2021-4-21

Hello everyone, this is a basic question for many of you and I would really appreciate if you can take the time and explain to me: How to display the actual values of my percentages on a pie chart and How to display percentage and labels on the pie chart.

TotalNumberOfCars = 75;
White = 34;
Black = 19;
Red = 12;
Silver = 2;
Grey = 3;
Other = 5;
% simple percentage 
Per_White = White/ TotalNumberOfCars * 100
Per_Black = Black / TotalNumberOfCars * 100
Per_Red = Red / TotalNumberOfCars * 100
Per_Silver = Silver / TotalNumberOfCars * 100
Per_Grey = Grey / TotalNumberOfCars * 100
per_Other = Other/TotalNumberOfCars * 100
% The results 45.333, 25.333, 16, 2.666, 4
%I missed up somewhere
X = [34 19 12 2 3 5];
pie (X)
Labels = { 'White' , 'Black' , 'Red' , 'Silver' , 'Grey', 'Other'};
pie(X, Labels)
%I also tried to make the percentages as a vector 
Y = [45.333, 25.333, 16, 2.666, 4];
pie(Y)

which produce mismatched percentages

2 个评论
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Walter Roberson 2021-4-20

在 MATLAB Online 中打开

White = 34;
Black = 19;
Red = 12;
Silver = 2;
Grey = 3;
White + Black + Red + Silver + Grey
ans = 70

... Does not total 75. You need an "other" which is 75 minus the total.

LeoAiE 2021-4-20

编辑：LeoAiE 2021-4-20

Hi Walter,

Thank you so much for responding I added ‘Other’ = 5 , and edited the code… and sorry about that by the way I was just making up data to get my question across. Back to the question, how to match the pie and the actual precentage ... Or I just got everything wrong / confusing myself :)

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Answer 1

Scott MacKenzie 2021-4-21

3
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/808177-how-to-display-the-actual-values-of-my-percentages-on-a-pie-chart#answer_681065

编辑：Scott MacKenzie 2021-4-21

在 MATLAB Online 中打开

Is the central issue combining a text label with the percentage? If so, perhaps this will work:

X = [34 19 12 2 3 5];
Labels = {'White', 'Black' , 'Red' , 'Silver' , 'Grey', 'Other'};
xPercent = X / sum(X) * 100;
newLabels = [];
for i=1:length(X)
    newLabels = [newLabels {sprintf('%s (%.1f%%)', Labels{i}, xPercent(i))}];     
end
pie(X, newLabels);