# How to calculate the hourly data points?

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aa on 6 Nov 2020
Commented: Peter Perkins on 20 Nov 2020
Hi everyone,
May someone help me here ..
I have a long data in time-date formate i.e. six columns YYYY MM DD HH MM SS. Each time values indicate an observation. I want to calcualte the number of observations per hours. It is importanmt to mentioned that frequency of observations is uneven i.e. 10 or 100 obsservation per hour and no observation for a couple of days. So the output must account the missing time as well wehre there is no observation recorded.
Thank You!
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aa on 6 Nov 2020
Thank you let me try this ... might be it will works but still i am not sure how this give me the event per data .. Ismember is something different from counts/hour ... I think so ,,, not sure ..

Ameer Hamza on 6 Nov 2020
Edited: Ameer Hamza on 6 Nov 2020
Try retime():
t = datetime(T.YYYY, T.MM, T.DD, T.HH, T.MM_1, T.SS);
TT = timetable(t, ones(size(t)));
newTT = retime(tt, 'hourly', 'sum');
newT = table(newTT.t, newTT.Var1, 'VariableNames', {'Time', 'count'});
Peter Perkins on 20 Nov 2020
Ameer solution is the right one, but actually, there's not really any need to turn newTT back into a table. You can leave it as a timetable.