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gqrs

    function varargout=gqrs(varargin)

     gqrs(recordName,N,N0,signal,threshold,outputName,highResolution)

        Wrapper to WFDB GQRS:
             http://www.physionet.org/physiotools/wag/gqrs-1.htm

        Creates a SQRS annotation file  at the current MATLAB directory.
        The detector algorithm is new and as yet unpublished.
        The annotation file will have the same name as the recorName file,
        but followed with the *.qrs 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, than
        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.

     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 singal to obtain the annotation (default
           = 1, first signal).

     threshold
           A 1x1 double. Specify the detection threshold (default = 1.00).
           If too many beats are missed, decrease threshold,
           if there are too many extra detections, increase threshold.

     outputName
           String. Save the ouput annotation file extension as *.outputName (default =
           *.qrs).

     highResolution
           Boolean. If false (0), does not read multifrequency signals in high
           resolution mode.

     Source code by George B. Moody

     MATLAB wrapper written by Ikaro Silva, 2013
     Last Modified:  December 10, 2013
     Version 1.0
     See also SQRS, RDANN, WQRS, BXB
     Since 0.9.5

     %Example
     N=5000;
     gqrs('mitdb/100',N);
     ann=rdann('mitdb/100','qrs',[],N);
     [tm,sig]=rdsamp('mitdb/100',[],N);
     plot(tm,sig(:,1));hold on;grid on
     plot(tm(ann),sig(ann,1),'ro')