Pie chart help grouping

Hi,

I want to make a pie chart group by one of my variable on a dataframe.

In python we can do :

my_data.groupby('Var1').sum().plot(kind='pie',y='Var2', autopct='%1.1f%%')

And I will obtain a pie chart of 'Var1' depending on 'Var2'

But I don't know how to do it in matlab.

How can I do this ?

Thank you very much for any help.

Answer 1

[Rahul]

Hi @Sophia Nador,

In order to plot a pie chart in MATLAB wherin one of the variables is dependant upon the another variable like 'Var1' dependant on 'Var2', consider using 'groupsuummary' and 'pie' functions provided by MATLAB.

Here is an example:

my_data = readtable(filename) % Reading file with data. 

groupedData = groupsummary(my_data, 'Var1', 'sum', 'Var2'); % Group by 'Var1' and sum 'Var2'

figure;
pie(groupedData.sum_Var2, groupedData.Var1); % Create pie chart
title('Pie Chart of Var1 grouped by Var2');

Consider referring to the following MATLAB Answers:

https://www.mathworks.com/matlabcentral/answers/2066301-how-to-create-a-group-summary-of-table-such-that-it-takes-latest-values

https://www.mathworks.com/matlabcentral/answers/2016031-create-a-pie-chart-knowing-the-percentage-value

The following MathWorks documentations can be referred to know more:

'groupsummary': https://www.mathworks.com/help/matlab/ref/double.groupsummary.html

'redtable': https://www.mathworks.com/help/matlab/ref/readtable.html

'pie': https://www.mathworks.com/help/matlab/ref/pie.html

Hope this helps. Thanks.