Define an event if there are > 5 signals detected in a minute

I have a datetime table containing detected 'signals' and their variables, including their exact timestamps.

I would like to define an 'event' if 5 or more signals are detected within a minute.

How could I implement this?

Many thanks for any help

[Edit: Here is a sample of my initial table. Signals are designated by type = 1. I need 5 or more signals in a minute to create an 'event']

DT = datetime ({'25-Jul-2018 00:00:03';'25-Jul-2018 00:00:07';'25-Jul-2018 00:00:07';...
    '25-Jul-2018 00:00:07';'25-Jul-2018 00:00:18';'25-Jul-2018 00:00:51';...
    '25-Jul-2018 00:00:51';'25-Jul-2018 00:00:52';'25-Jul-2018 00:00:53';...
    '25-Jul-2018 00:01:05';'25-Jul-2018 00:01:12';'25-Jul-2018 00:01:18';...
    '25-Jul-2018 00:01:32';'25-Jul-2018 00:01:34';'25-Jul-2018 00:01:36';...
    '25-Jul-2018 00:01:38';'25-Jul-2018 00:01:38';'25-Jul-2018 00:01:38';...
    '25-Jul-2018 00:01:39';'25-Jul-2018 00:01:40';'25-Jul-2018 00:01:49';...
    '25-Jul-2018 00:01:52';'25-Jul-2018 00:01:54';'25-Jul-2018 00:01:54';...
    '25-Jul-2018 00:01:55';'25-Jul-2018 00:01:56';'25-Jul-2018 00:02:05';...
    '25-Jul-2018 00:02:09';'25-Jul-2018 00:02:22';'25-Jul-2018 00:02:24';...
    '25-Jul-2018 00:02:26';'25-Jul-2018 00:02:33';'25-Jul-2018 00:02:42';...
    '25-Jul-2018 00:02:46';'25-Jul-2018 00:02:50';'25-Jul-2018 00:02:51';...
    '25-Jul-2018 00:02:51';'25-Jul-2018 00:03:22';'25-Jul-2018 00:03:22';...
    '25-Jul-2018 00:03:25';'25-Jul-2018 00:03:25';'25-Jul-2018 00:03:28';...
    '25-Jul-2018 00:03:30';'25-Jul-2018 00:03:35';'25-Jul-2018 00:03:38';...
    '25-Jul-2018 00:03:41';'25-Jul-2018 00:04:09';'25-Jul-2018 00:04:14';...
    '25-Jul-2018 00:04:29';'25-Jul-2018 00:04:30';'25-Jul-2018 00:04:39';...
    '25-Jul-2018 00:04:40';'25-Jul-2018 00:04:48';'25-Jul-2018 00:04:55';...
    '25-Jul-2018 00:04:55';'25-Jul-2018 00:04:55';'25-Jul-2018 00:04:55';...
    '25-Jul-2018 00:04:56';'25-Jul-2018 00:04:57';'25-Jul-2018 00:04:58';...
    '25-Jul-2018 00:05:01';'25-Jul-2018 00:05:01';'25-Jul-2018 00:05:02';...
    '25-Jul-2018 00:05:04';'25-Jul-2018 00:05:06';'25-Jul-2018 00:05:11';...
    '25-Jul-2018 00:05:26';'25-Jul-2018 00:05:27';'25-Jul-2018 00:05:28';...
    '25-Jul-2018 00:05:29';'25-Jul-2018 00:05:32';'25-Jul-2018 00:05:35'});
Type = [0;0;1;0;0;0;1;0;0;0;0;0;1;1;1;0;0;0;0;0;0;0;0;1;1;1;1;1;1;0;0;0;0;...
    0;1;1;0;0;0;0;0;0;0;1;1;1;1;1;1;1;0;0;0;0;0;0;0;0;0;1;0;1;0;0;0;0;1;1;0;...
    0;1;1];
TT1 = timetable(DT,Type);

Answer 1

[Peter Perkins]

I'm going to assume that "I would like to define an 'event' if 5 or more signals are detected within a minute." and "check if there is an event outside of 'regular' time periods" means that you want a trailing one-minute moving window. Otherwise this is trivial using retime.

movsum can do this:

>> TT1 = retime(TT1,unique(TT1.DT),"sum"); % get rid of duplicate times by summing
>> TT1.Event = (movsum(TT1.Type,[minutes(1) 0],['SamplePoints'],TT1.DT) > 4)
TT1 =
59×2 timetable
DT             Type    Event
____________________    ____    _____
25-Jul-2018 00:00:03     0      false
25-Jul-2018 00:00:07     1      false
25-Jul-2018 00:00:18     0      false
25-Jul-2018 00:00:51     1      false
25-Jul-2018 00:00:52     0      false
25-Jul-2018 00:00:53     0      false
25-Jul-2018 00:01:05     0      false
25-Jul-2018 00:01:12     0      false
25-Jul-2018 00:01:18     0      false
25-Jul-2018 00:01:32     1      false
25-Jul-2018 00:01:34     1      false
25-Jul-2018 00:01:36     1      false
25-Jul-2018 00:01:38     0      false
25-Jul-2018 00:01:39     0      false
25-Jul-2018 00:01:40     0      false
25-Jul-2018 00:01:49     0      false
25-Jul-2018 00:01:52     0      false
25-Jul-2018 00:01:54     1      false
25-Jul-2018 00:01:55     1      true 
25-Jul-2018 00:01:56     1      true 
25-Jul-2018 00:02:05     1      true 
25-Jul-2018 00:02:09     1      true 
25-Jul-2018 00:02:22     1      true 
25-Jul-2018 00:02:24     0      true 
[snip]
25-Jul-2018 00:03:38     1      false
25-Jul-2018 00:03:41     1      true 
25-Jul-2018 00:04:09     1      false
25-Jul-2018 00:04:14     1      true 
25-Jul-2018 00:04:29     1      true 
25-Jul-2018 00:04:30     1      true 
25-Jul-2018 00:04:39     0      true 
25-Jul-2018 00:04:40     0      true 
25-Jul-2018 00:04:48     0      false
25-Jul-2018 00:04:55     0      false
25-Jul-2018 00:04:56     0      false
25-Jul-2018 00:04:57     0      false
25-Jul-2018 00:04:58     1      true 
25-Jul-2018 00:05:01     1      true 
25-Jul-2018 00:05:02     0      true 
25-Jul-2018 00:05:04     0      true 
25-Jul-2018 00:05:06     0      true 
25-Jul-2018 00:05:11     0      true 
25-Jul-2018 00:05:26     1      true 
25-Jul-2018 00:05:27     1      true 
25-Jul-2018 00:05:28     0      true 
25-Jul-2018 00:05:29     0      true 
25-Jul-2018 00:05:32     1      true 
25-Jul-2018 00:05:35     1      true 

[Butterflyfish]

That works! Thank you!