box plot from timetable data

Hello all,

I have a set of precipitation data 7440x4 double, where 1st column is year, 2nd is month, 3rd is day, and last 4th column is precipitation values (mm/day).

I had to find the monthly maxima and applied the code below. Although I also need to create a boxplot displaying the monthly maxima across the years, with time labelled on the x axis.

Could you please provide some help in creating a boxplot from timetable data? Should I convert it into a matrix? How do I do it?

Thanks a lot for your help

mm=precip(:,4);

Times = datetime(precip(:,1:3)); %convert to datetime

table = timetable(Times, mm); % Convert To ‘timetable’

monthly_max = retime(table, 'monthly', 'max');

Answer 1

[Mathieu NOE]

hello Giulia

you can do a box plot directly with timetable data

example :

% Create a sample timetable
time = datetime({'2025-01-01'; '2025-01-02'; '2025-01-03'; '2025-01-04'; '2025-01-05';'2025-02-01'; '2025-02-02'; '2025-02-03'; '2025-02-04'; '2025-02-05'});
data = [10; 15; 20; 25; 30 ; 40; 45; 50; 55; 60];
TT = timetable(time, data);

% Extract data for the box plot
values = TT.data;

% Create the box plot
boxplot(values);

% Add labels and title
title('Box Plot of Timetable Data');
ylabel('Values');

●

% Group data by month (example)
TT.Month = month(TT.time); % Add a grouping variable
boxplot(TT.data, TT.Month);

% Add labels and title
title('Box Plot Grouped by Month');
xlabel('Month');
ylabel('Values');

[GIULIA]

Thanks a lot for your help Mathieu!

[Mathieu NOE]

as always , my pleasure !