# Calculating an average week with datapoint every 15 minutes

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Thomas Steip on 18 Dec 2020
Answered: Rishabh Mishra on 21 Dec 2020
I have a dataset with values every 15 minutes for 3 months and I need to compute a dataset for the average week.
This means with each data point being the average of all the data points at the same time. (For example the data point of the average week at monday 12:15 is the average of all data points at monday 12:15 during the 3 months)
Does someone know a way to do this?
Attached is the dataset over the three months and the corresponding datetime dataset.

Rishabh Mishra on 21 Dec 2020
Hi,
Use the code below to find the average values recorded at 00:15 on all the Mondays in the given datetime array.
% find indices for datetimes with day = Monday & time = 00:15
% Weekday of Monday = 2
% Hour-value of time = 0
% Minute-value of time = 15
index = weekday(t) == 2 & hour(t) == 0 & minute(t) == 15;
% Find average ignoring NaN values
Similarly use the same code to generate remaining data points.
Hope this helps.