Find Interval in Array With Most Updates

10 views (last 30 days)
Michael Daly
Michael Daly on 30 Jan 2020
Edited: Mohammad Sami on 30 Jan 2020
If I have an array of times (seconds), what is the best way to find the maximum updates over a 10 second interval?
times = [1 2 3 4 6 7 10 12 14 15 17 19 20 21 29 30 32 34 36 37 40 41 42 43 44 45 49 50];
My current way does it with a for loop but figured there must be a better way.
interval_counts = zeros(1,length(times));
for ii = 1:length(times)
interval_start = times(ii);
interval_end = interval_start + 10;
cur_inds = times >= interval_start & times < interval_end;
interval_counts(ii) = sum(cur_inds);
end
max(interval_counts)
Appreciate any help!

Answers (1)

Mohammad Sami
Mohammad Sami on 30 Jan 2020
Edited: Mohammad Sami on 30 Jan 2020
Another option can be
% this will work for integer times
times = [1 2 3 4 6 7 10 12 14 15 17 19 20 21 29 30 32 34 36 37 40 41 42 43 44 45 49 50];
one_sec_int = min(times):max(times);
is_update = ismember(one_sec,times);
checking_interval = 10;
num_updates_interval = movsum(is_update,[0 (checking_interval-1)]);
%M = movsum(A,[kb kf]) computes the sum with a window of length kb+kf+1 that includes the element in the current position, kb elements backward, and kf elements forward.
[max_n_updates,idx] = max(num_updates_interval);
first_time_when_max_update = one_sec_int(idx);

Categories

Find more on Data Types in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!