# how to extract previous week and month number of same hour?

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MUKESH KUMAR le 16 Juin 2020
Commenté : Nada Mounir le 28 Fév 2022
I had load data of one year, half houly data of load (1*17520), I want to add a column having load data of previous week (same day & time period) and another column having previous day data at same time slot
We can keep blank for initial week/day data because for that previous data is not available here.
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MUKESH KUMAR le 16 Juin 2020
Ok sure
Steven Lord le 17 Juin 2020
KSSV: if MUKESH KUMAR has the date and time data stored as a datetime array or as the time vector in a timetable, there's no need to split that data to jump backwards a day or a week.
d = datetime('now')
dMinusWeek = d - calweeks(1)
dMinusDay = d - caldays(1)

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### Réponse acceptée

Sujay C Sharma le 17 Juin 2020
Hi,
Since the number of load entries per day is fixed at 48 (half-hourly data), this can be done using the circshift function on the load column in your data. Here is an example of how you can use circshift to achieve what you want:
NumEntriesPerDay = 48;
DataPrevDay = circshift(data,NumEntriesPerDay*1);
DataPrevDay(1:NumEntriesPerDay*1) = NaN;
DataPrevWeek = circshift(data,NumEntriesPerDay*7);
DataPrevWeek(1:NumEntriesPerDay*7) = NaN;
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MUKESH KUMAR le 18 Juin 2020
thanks
Nada Mounir le 28 Fév 2022
Please it doesn't work for me i have the same problem

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