# Missing points before and after the R peaks

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Ioana Cretu le 9 Fév 2021
Commenté : darova le 9 Fév 2021
I have a signal which I want to segment in heartbeats. I have the location of the R peaks and want to create a sliding window which takes 100 points before and 100 points after each peak, but before the first beat are just 78 points and after the last peak are also less than 100.
How can I avoid those peaks and just select the beats that have enough points before an after the R-peak?
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Rik le 9 Fév 2021
Don't you mean a for-loop? If that is the case you could compute the indices first and use continue if any of them is invalid.
Ioana Cretu le 9 Fév 2021
sorry I used a for loop, idk why I wrote if

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### Réponses (1)

Rik le 9 Fév 2021
Something like this is what I meant:
before=100; after=100;
for n=1:numel(qrs_i)
ind=(qrs_i(n)-before):(qrs_i(n)+after);
if ind(1)<1 || ind(end)>numel(ECG), continue, end
beat(n,:)=ECG(ind);
end
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Ioana Cretu le 9 Fév 2021
Thank you Rik! This is exactly what I needed
darova le 9 Fév 2021

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