# How to find the most frequently repeated time interval?

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Asrorkhuja Ortikov on 17 Sep 2020
Matlab warrior! In the data travels, there is a column with start and end time. Each interval has certain value or zero. I have to find the most repeated time (hot spot) among those travels which is not equal to zero. For ex, among two, 1st interval "06:30"-"07:30", and second "06:00 - 07:00", then hotspot would be "06:30-07:00". I have tried smth like:
for i = 1:length(end_timedumb)
[~, ~, ~, H, MN, ~] = datevec(st_timesumb(i));
T_Stdumb = H*60+MN+1;
[~, ~, ~, H, MN, ~] = datevec(end_timedumb(i));
T_Enddumb = H*60+MN+1;
if isnan(T_Enddumb)
continue
else
minscale_DCH1(T_Stdumb:T_Enddumb,1) = minscale(T_Stdumb:T_Enddumb,1) + 1;
end
end
TimeM = 1:length(minscale);
TimeH = TimeM/60;
figure
but that gives me only the overall peak that values accumulated among intervals. However, I need to find specific interval that is the most common.
##### 2 CommentsShowHide 1 older comment
Asrorkhuja Ortikov on 18 Sep 2020
Hey, thanks for the thread. I just did, there are several time durations, it's up to you which one to choose.

Turlough Hughes on 18 Sep 2020
First I read in data as a string array
opts = detectImportOptions(filename,'TextType','string');
opts.SelectedVariableNames = {'Var2','Var3'}; % alternatively {'Var4','Var5'}, or {'Var6','Var7'}
Convert each string to a duration in terms of minutes from 00:00
D = minutes(duration(D,'InputFormat','hh:mm'));
D(D(:,2)==0,2)=1440; % set 00:00 in the second column to 1440 minutes
To find the hotspot, I create a logical array, M, which has the same number of rows as D, and 1440 columns (one for each minute of the day). Values are set to true if they fall within the range:
M = false(size(D,1),24*60);
for c = 1:size(D,1)
M(c,D(c,1)+1:D(c,2))=true;
end
You can then sum up each column to find the frequency with which a given minute appeared in the time intervals.
figure(), plot(duration(0,0,0):minutes(1):duration(23,59,0),sum(M))
One thing to note, if the range from your data begins and ends on the same minute then that minute is included using the code as it is.
Asrorkhuja Ortikov on 23 Sep 2020
@Turlough Hughes, thank you. I will make another question, you made my life much easier )

R2020a

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