Loop to check if 2 conditions are true for values 1:n, (1:n)+1, (1:n)+2, etc. in a vector and save ID
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Loriann Chevalier on 16 May 2022
I have a time series of daily precipitation (i.e. a vector of 365x1) and I would like to test 2 conditions :
- is the cumulative rainfall over 7 days > threshold (e.g. 10mm)
- are there at least 4 out of 7 days with precipitation (RF > 0mm)
I want to make a loop to take values 1:7, check whether the 2 conditions above are met, go to 2:8, 3:9, etc., until the first occurrence of a 7-days period for which both conditions are met. Then save the ID of the last day of the 7-days period (e.g. if the conditions are met first for 43:49, save the ID of interest is 49, I don't care about the value in the vector, only the ID).
I have no idea how to even start or what function to use, so any help is welcome.