Extracting QT from EKG signal

[poster]

Basically, I want to extract the QT from an EKG signal, for this I am following some steps from an article. Firstly, I am filtering the signal with a pass-band filter, then I have to apply the coiflet-1 CWT transform(never used it before) due to QT Pattern = (CWT Output)^2 and then choose
QRS Pattern(i) = {0 , QT Pattern(i) < A
QT Pattern(i), otherwise.
This is what I did until now, but i found myself in a moment when i don't know what to do next:

**clear all

clc

close all

[filename, pathname] = uigetfile('semnal.dat');

if isequal(filename, 0) || isequal(pathname, 0)   

    disp('File input canceled.');  

   ECG_Data = [];  

else

fid=fopen(filename,'r');

end;

time=10;

f=fread(fid,2*360*time,'ubit12');

semnal=f(1:2:length(f));

figure(1)

plot(semnal)



xlabel('samples');

ylabel('time')





fs = 250;                                                % Sampling Frequency (Hz)







N=length(semnal);

fs=250;

t=[0:N-1]/fs;

fcutlow=0.5;   %low cut frequency in Hz

fcuthigh=40;   %high cut frequency in Hz

[b,a]=fir1(330,[fcutlow,fcuthigh]/(fs/2),'bandpass');

semnal_filtrat=filter(b,a,semnal)

figure(2)

plot(t,semnal_filtrat)



%CTW 





x = [1, 2, 3, 4];

scales = [9];

wavelet_name = 'coif2';

coefs = cwt(x,scales, wavelet_name)**

I am waiting for any idea, thank you!!

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