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Error in Heart Rate Calculation

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Shraddha Joshi
Shraddha Joshi 2016-4-23
Below is the code I have used in Pan Tompkins Algorithm to calculate Heart Rate:
N=length(ecg_h); duration_in_sec=N/fs; duration_in_min=duration_in_sec/60; Heart_Rate=beat_count/duration_in_min;
where, beat_count=beat_count+1 as used in lines 337 and 377 in file attached below. This is because beat counts refer to dominant R-peaks detected in Pan Tompkins Algorithm. But the error I am getting is
Undefined function or variable "ecg_h".
Error in pan_tompkin2 (line 133) N=length(ecg_h);
Could you please where I am going wrong and how to debug this error? Also I want to know how can I store all these heart rates calculated for different signals to be stored in an array?

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