Can one use retime function to calculate mean and sum of the same variable?

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alpedhuez 2022-5-15

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回答： Gagan Agarwal 2023-9-22

Suppose I have a timetable

                            Visitors
January 1                  10
January 3                  20
February 10                30
February 12                10

Then I want to create a table

                                                Mean of Visitors     Sum of Visitors
January                                           15                           30
February                                          20                          40

Can one do this with retime function? if not, how?

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dpb 2022-5-15

???? You mean functions, @alpedhuez?

alpedhuez 2022-5-15

As another example that may getting a bit too complicated.

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Gagan Agarwal 2023-9-22

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Hi alpedhuez,

Yes, it is possible to calculate the mean and sum of the same variable using the 'retime' function.

You can refer to the following code snippet as an example to perform the calculation on your table:

% The sample data is stored in a table 'T' 
T = table(["January 1"; "January 3"; "February 10"; "February 12"], [10; 20; 30; 10]); 
T.Properties.VariableNames = {'Date', 'Value'}; 
T.Date = datetime(T.Date, 'InputFormat', 'MMMM d') 
% T is converted to timetable using 'table2timetable' function. 
TT = table2timetable(T); 
% 'retime' function is then applied on 'TT' to calculate the mean 
T1 = retime(TT, 'monthly', 'mean'); 
% The 'retime' function is then applied on 'TT' to calculate the sum 
T2 = retime(TT, 'monthly', 'sum'); 
% 'T1' and 'T2' are combined into a single table called 'ans' which displays the sum and mean values 
ans = join(T1,T2) 