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 2022-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/1720315-loop-to-check-if-2-conditions-are-true-for-values-1-n-1-n-1-1-n-2-etc-in-a-vector-and-save-i

评论： Loriann Chevalier 2022-5-16

采纳的回答： Torsten

Hi everyone,

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.

Thanks !

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KALYAN ACHARJYA 2022-5-16

Start with example data, just for two weeks (generate random data), it can be possible.

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Answer 1

Torsten 2022-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/1720315-loop-to-check-if-2-conditions-are-true-for-values-1-n-1-n-1-1-n-2-etc-in-a-vector-and-save-i#answer_964825

在 MATLAB Online 中打开

for i=1:365-7+1
    period = rainfall(i:i+6);
    sum_period = sum(period);
    n = numel(find(period>0));
    if sum_period > threshold && n >= 4
        ID = i+6;
        break
    end
end