detecting no. of events

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Heartrin
Heartrin 2015-11-5
评论： Heartrin 2015-11-5
I have an array of 2000x1 = D .
i have a condition D>25. for D>25 higher than 20 sec i should count 1 event.
how can i do this in matlab?

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Thorsten
Thorsten 2015-11-5
编辑：Thorsten 2015-11-5
If D contains an entry every second, you can use:
D = randi(2000, 1, 20); % sample data
di = diff([0 D > 25 0]);
i1 = find(di == 1);
i2 = find(di == -1);
Nevents = nnz(i2 - i1 > 20);
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Thorsten
Thorsten 2015-11-5
What's the size of D? If it is 20000x1 as you said in your original post, then it should work. If it is 1x20000, you have to use
di = diff([0; D > 25; 0]);
Heartrin
Heartrin 2015-11-5
Thanks . you are awesome.

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