MATLAB File Help: wqrs | View code for wqrs | WFDB Contents

wqrs

    function varargout=wqrs(varargin)

     wqrs(recordName,N,N0,signal,threshold,findJ,powerLineFrequency,resample)

        Wrapper to WFDB WQRS:
             http://www.physionet.org/physiotools/wag/wqrs-1.htm

        Creates a WQRS annotation file  at the current MATLAB directory.
        The annotation file will have the same name as the recorName file,
        but followed with the *.wqrs suffix. Use RDANN to read the annoations
        into MATLAB's workspace in order to read the sample QRS locations.

        If recordName is the path to a record at PhysioNet's database, then
        the annation files will be stored in a subdirectory with the same relative
        path as recordName and under the current directory.

        NOTE: In order to read the generated annotation file using RDANN, it is
        necessary to have the WFDB record (*.hea and *.dat) files in the same
        directory as the annotation file.

     CITING CREDIT: To credit this function, please cite the following paper in your work:

     Zong, W., G. B. Moody, and D. Jiang."A robust open-source algorithm to detect onset
     and duration of QRS complexes." Computers in Cardiology, 2003. IEEE, 2003.

     Required Parameters:

     recorName
           String specifying the name of the record in the WFDB path or
           in the current directory.

     Optional Parameters are:

     N
           A 1x1 integer specifying the sample number at which to stop reading the
           record file (default read all = N).
     N0
           A 1x1 integer specifying the sample number at which to start reading the
           annotion file (default 1 = begining of the record).

     signal
           A 1x1 integer. Specify the signal to obtain the annotation (default
           = 1, first signal).

     threshold
           A 1x1 double. Specify the detection threshold in millivolts
          (default = 100). Use higher values to reduce false detections, or lower values to
           reduce the number of missed beats.

     findJ
           A 1x1 boolean. Find and annotate J-points (QRS ends) as well as QRS onsets.
           Default is false.

     powerLineFrequency
           A 1x1 double. Specify the power line main frequency in Hz (default=
           60 Hz), wqrs will apply a notch filter of the specified frequency
           to the input signal before length-transforming it.

     resample
           A 1x1 boolean. Resample the input at 120 Hz if the power line frequency
           is 60 Hz, or at 150 Hz otherwise (default= false : do not resample).

     Source code written by Wei Zong and George B. Moody.

     MATLAB wrapper written by Ikaro Silva, 2013
     Last Modified: -
     Version 1.0
     Since 0.0.1

     %Example - Requires write permission to current directory
    wqrs('challenge/2013/set-a/a01');