README - Part of the trqt package submitted for the 2006 CinC challenge
Copyright (C) 2006  DA Tironi, R Sassi and LT Mainardi
This software is released under the terms of the GNU General
Public License (http://www.gnu.org/copyleft/gpl.html).

HOW TO USE THE CODE

1) First, you need to install two freely available software:

  a) install the wfdb software package, a software for viewing, analyzing, and creating 
  recordings of physiologic signals which is a fundamental part of the PhysioToolkit.
  It might be found at http://www.physionet.org/physiotools/wfdb.shtml

  b) install ecgpuwave. ecgpuwave is a QRS detector and ECG waveform limit locator, 
  developed by Pablo Laguna, Raimon Jané, Eudald Bogatell, and David Vigo Anglada. It is
  part of the PhysioToolkit and freely available at 
  http://www.physionet.org/physiotools/ecgpuwave/

2) Unzip the source file trqt.zip in a folder of choice (e.g. "trqt").

3) Put in the same folder (trqt) the files of the ECG you wish to analyze (.hea, .dat, .xyz).

4) Compile the C code cqrs.c issuing the command
    gcc -o cqrs cqrs.c

5) From a command line interface (shell or command prompt window) run the 
following commands (where "recordname" is the name of the ECG file; on linux you might
find it handy to put them in a shell script):

    ecgpuwave -r recordname -a epw -s2
    rdann -r recordname -a epw > temp.rdn
    rm recordname.epw
    cqrs temp.rdn > temp.lqt
    rdsamp -r recordname -s 2 > temp.sam

6) From within Matlab, go to the folder where you placed the files (e.g. cd trqt) 
  then issue the command
  
    trqt
  
  the value of the points Q and T (in ms) will be printed in the Matlab shell. They are
  also contained in the variables Q and T