Inserting a column of repeated values

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Queena Edwards
Queena Edwards on 31 Mar 2022
Commented: Queena Edwards on 1 Apr 2022
I have the following table
T2 =
3557×3 table
Date Time (Hours) Total Rainfall(mm)
___________ ____________ __________________
NaT NaN 1
03-Mar-2019 10:00:00 0.51
03-Mar-2019 11:00:00 0
03-Mar-2019 12:00:00 0
03-Mar-2019 13:00:00 0
03-Mar-2019 14:00:00 0
03-Mar-2019 15:00:00 1.27
03-Mar-2019 16:00:00 0
03-Mar-2019 17:00:00 0
03-Mar-2019 18:00:00 1.02
NaT NaN 2
11-Mar-2019 17:00:00 3.3
NaT NaN 3
12-Mar-2019 18:00:00 1.78
12-Mar-2019 19:00:00 1.78
12-Mar-2019 20:00:00 0.51
12-Mar-2019 21:00:00 0
12-Mar-2019 22:00:00 11.17
NaT NaN 4
I would like to insert a column stating the number of hours between the NaN. It should look like:
T2 =
3557×3 table
Date Time (Hours) No.of Hours Total Rainfall(mm)
___________ ____________ ___________ __________________
NaT NaN 1
03-Mar-2019 10:00:00 1 0.51
03-Mar-2019 11:00:00 2 0
03-Mar-2019 12:00:00 3 0
03-Mar-2019 13:00:00 4 0
03-Mar-2019 14:00:00 5 0
03-Mar-2019 15:00:00 6 1.27
03-Mar-2019 16:00:00 7 0
03-Mar-2019 17:00:00 8 0
03-Mar-2019 18:00:00 9 1.02
NaT NaN 2
11-Mar-2019 17:00:00 1 3.3
NaT NaN 3
12-Mar-2019 18:00:00 1 1.78
12-Mar-2019 19:00:00 2 1.78
12-Mar-2019 20:00:00 3 0.51
12-Mar-2019 21:00:00 4 0
12-Mar-2019 22:00:00 5 11.17

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Accepted Answer

Akira Agata
Akira Agata on 1 Apr 2022
Ran in:
How about the following method?
% Sample data
load('outdoors.mat');
T = timetable2table(outdoors);
T.Humidity([1, 6, 15]) = NaN; % Put some NaNs
% Create group ID
idx = isnan(T.Humidity);
group = cumsum(idx);
% Apply cumsum for each group
NumOfHours = splitapply(@(x){cumsum(x)}, ~idx, group);
NumOfHours = cell2mat(NumOfHours);
NumOfHours(idx) = NaN;
% Add and move the column
T.NumOfHous = NumOfHours;
T = movevars(T, 'NumOfHous', 'After', 'Humidity');
% Show the result
disp(T)
Time Humidity NumOfHous TemperatureF PressureHg ___________________ ________ _________ ____________ __________ 2015-11-15 00:00:24 NaN NaN 51.3 29.61 2015-11-15 01:30:24 48.9 1 51.5 29.61 2015-11-15 03:00:24 48.9 2 51.5 29.61 2015-11-15 04:30:24 48.8 3 51.5 29.61 2015-11-15 06:00:24 48.7 4 51.5 29.6 2015-11-15 07:30:24 NaN NaN 51.5 29.6 2015-11-15 09:00:24 49 1 51.5 29.6 2015-11-15 10:30:24 49.1 2 51.3 29.6 2015-11-15 12:00:24 49.1 3 51.3 29.61 2015-11-15 13:30:24 49.1 4 51.5 29.61 2015-11-15 15:00:24 48.9 5 51.5 29.61 2015-11-15 16:30:24 49 6 51.5 29.61 2015-11-15 18:00:24 49 7 51.3 29.61 2015-11-15 19:30:24 48.9 8 51.3 29.6 2015-11-15 21:00:24 NaN NaN 51.2 29.61 2015-11-15 22:30:24 48.9 1 51.1 29.61 2015-11-16 00:00:24 48.7 2 51.2 29.61 2015-11-16 01:30:24 48.6 3 51.3 29.61 2015-11-16 03:00:24 48.4 4 51.5 29.61 2015-11-16 04:30:24 48.3 5 51.6 29.61 2015-11-16 06:00:24 47.7 6 51.6 29.61 2015-11-16 07:30:24 47.9 7 51.6 29.61 2015-11-16 09:00:24 48.2 8 51.6 29.61 2015-11-16 10:30:24 48 9 51.6 29.61 2015-11-16 12:00:24 47.9 10 51.6 29.61 2015-11-16 13:30:24 47.8 11 51.6 29.61 2015-11-16 15:00:24 47.9 12 51.5 29.61 2015-11-16 16:30:24 47.6 13 51.6 29.61 2015-11-16 18:00:00 47.6 14 51.6 29.61 2015-11-16 18:00:24 47.7 15 51.6 29.61 2015-11-16 19:30:24 47.5 16 51.6 29.61 2015-11-16 21:00:24 47.6 17 51.8 29.62 2015-11-16 22:30:24 47.3 18 51.8 29.62 2015-11-17 00:00:24 47.8 19 51.8 29.61 2015-11-17 01:30:24 48 20 51.6 29.62 2015-11-17 03:00:24 47.9 21 51.6 29.62 2015-11-17 04:30:24 48 22 51.6 29.62 2015-11-17 06:00:24 48.1 23 51.6 29.61 2015-11-17 07:30:24 48.1 24 51.5 29.62 2015-11-17 09:00:24 48.3 25 51.2 29.62 2015-11-17 10:30:24 48.5 26 51.1 29.61 2015-11-17 12:00:24 48.4 27 51.1 29.61 2015-11-17 13:30:24 48.5 28 51.1 29.61 2015-11-17 15:00:24 48.5 29 51.2 29.61 2015-11-17 16:30:24 48.6 30 51.2 29.61 2015-11-17 18:00:24 48.7 31 50.9 29.61 2015-11-17 19:30:24 49 32 50.8 29.61 2015-11-17 21:00:24 49.3 33 50.8 29.61 2015-11-17 22:30:24 49.5 34 50.7 29.61 2015-11-18 00:00:24 49.5 35 50.8 29.61 2015-11-18 01:30:24 49.5 36 50.8 29.61
  1 Comment
Queena Edwards
Queena Edwards on 1 Apr 2022
I made some changes based on my code but this works. Thank you so much!

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