Matlab interpretation array questions

Hi All,

I find and ECG signal generator code in matlab and I want to translate to my controller in C and some lines are unclear for me. Any help is welcome. What the below codes does ? 1) t_line=0:1/fs:duration; %time line, seconds fs and duration are constant values

2) QRS_wave=zeros( size(t_line) ); %QRS waveform is declared, but on the code I see referencies to QRS1=m2*index2time(i_t1:i_t2)-(m2*t1-left); QRSwave(i_t1:i_t2)=QRS1; What is QRS1 and what is QRSwave ? relation to QRS_wave ?

Thanks for anyone who can help ! Zoltan

Answer 1

[KSSV]

I think you are talking about this code. https://www.physionet.org/physiotools/matlab/ECGwaveGen/ECGwaveGen.m

qrs_start=t1;   % begining time 
t2=t1+d1;       % d1 = d1=0.4375*d; d can be changed 
i_t1=time2index(t1); i_t2=time2index(t2);  % change time to indices, this is a function given 
left=0; right=0.875*amp;   
m1=(right-left)/(t2-t1);   
QRS1=m1*index2time(i_t1:i_t2)-(m1*t1-left);     % picking times from the indices 
QRSwave(i_t1:i_t2)=QRS1;                        % append first segment data to final result

Answer 2

[Zoltan Szabo]

Yes KSSV, is that one. :)