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ann2rr returns ghost beats

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
bioinformatics

Research direction

Start in hr.py at ann2rr, where rr_interval is calculated with calc_rr(ann.sample, fs=ann.fs). Reproduce the behavior with annotations containing labels such as (N and (AFIB, then verify that additional annotation locations no longer create surplus intervals or alter the rhythm at those points.

Written by the indexing model from the issue text.

Description

Hi,

If the input file, say `atr', contains additional labels, such as (N and (AFIB, ann2rr returns surplus rr intervals at the location of these labels.

Details:
In ann2rr in hr.py the rr intervals are calculated:
rr_interval = calc_rr(ann.sample, fs=ann.fs)

ann.sample contains the beat locations + the annotation location. Hence, ann2rr splits the rr interval which spans over each annotation location into two. This changes the heart rhythm at critical points. For example, at the beginning and end of atrial fibrillation, i.e. at (AFIB and (N.

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