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heartbeats

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heartbeats [2010/06/14 23:33] – jochenheartbeats [2010/06/29 17:17] (current) – updated help jochen
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 The [[xff]] IO reading class now supports reading the following formats: The [[xff]] IO reading class now supports reading the following formats:
   * ACQ (up until version <= 3.9.7)   * ACQ (up until version <= 3.9.7)
-  * TXT (use ''<nowiki>object = xff('*.ntt');</nowiki>'' to read!)+  * TXT (use ''<nowiki>object = xff('*.ntt');</nowiki>'' or ''<nowiki>object = xff(filename, 'ntt');</nowiki>'' to read!)
 and further formats might be added based on request and urgency. and further formats might be added based on request and urgency.
 +
 +In case the data is in a different format, you must ensure to first convert into one of the formats above or into a MAT file, which then can be read used like this:
 +
 +<code matlab heartbeats_readmat.m>% load a mat file (e.g. an ACQ->MAT converted file)
 +load HPS1344_session1_ECG.mat;
 + 
 +% create new NTT (used for methods on data!)
 +ntt = xff('new:ntt');
 + 
 +% store data from mat file in ntt
 +ntt.Data = data;</code>
  
 ===== Reference (help) ===== ===== Reference (help) =====
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 <file>  heartbeats  - detect heart beats and frequency in physio data <file>  heartbeats  - detect heart beats and frequency in physio data
    
-  FORMAT:       [bp, bs, bf, bv, cp, wgd, wd] = heartbeats(sig [, opts])+  FORMAT:       [bp, bs, bf, bv, cp, wgd, wd, hrv] = heartbeats(sig [, opts])
    
   Input fields:   Input fields:
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          .badt      t-threshold for detecing irregularity (default: 25)          .badt      t-threshold for detecing irregularity (default: 25)
          .bppre     pre-defined positions (no detection, only inspection)          .bppre     pre-defined positions (no detection, only inspection)
 +         .calc      preprocessing calculcation, one of
 +                    {'none'} - don't to anything (default)
 +                    {'absdiff'} - use abs(diff(data))
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.1
 +                    {'diffsq'} - square the diff of the data
 +                        if .detlength is not given, will be set to 0.01
 +                        if .skewdt is not given, will be set to 0.05
 +                    {'fourthz'} - fourth power of the z-transformed data
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.04
 +                    {'squarez'} - square the z-transformed data
 +                        if .detlength is not given, will be set to 0.03
 +                        if .skewdt is not given, will be set to 0.1
 +                    {'thirdz'} - third power of the abs z-transformed data
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.06
          .cleanup   interactive cleanup (default: false)          .cleanup   interactive cleanup (default: false)
          .detlength detection length threshold in seconds (default: 0.05)          .detlength detection length threshold in seconds (default: 0.05)
 +         .freq      data frequency in Hz (default: 1000)
          .pflength  pre-filter length in seconds (default: 0.025)          .pflength  pre-filter length in seconds (default: 0.025)
          .pfreps    pre-filter repetitions (default: 2)          .pfreps    pre-filter repetitions (default: 2)
-         .freq      data frequency in Hz (default: 1000) 
          .plot      plot mean +/- std estimate of signal (default: false)          .plot      plot mean +/- std estimate of signal (default: false)
 +         .plotfreq  samples per second to plot (default: 50)
          .plotwin   plot window size in seconds (default: 6)          .plotwin   plot window size in seconds (default: 6)
 +         .resfreq   resample data prior to detection (default: [])
          .segsize   segmentation size in seconds (default: 5)          .segsize   segmentation size in seconds (default: 5)
          .segstep   stepping (window shift) in seconds (default: 1)          .segstep   stepping (window shift) in seconds (default: 1)
-         .windsor   windsorizing threshold in std's (default: 3)+         .skewdt    skewness detection threshold multiplier (default: 0.5) 
 +         .winsor    winsorizing threshold in std's (default: 3)
    
   Output fields:   Output fields:
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         wgd         guess whether window is good or not         wgd         guess whether window is good or not
         wd          windowed data (in 100Hz resolution, interpolated)         wd          windowed data (in 100Hz resolution, interpolated)
 +        hrv         output of computehrv(bp)
    
-  Note: this function is still preliminary</file>+  Note: this function is still preliminary, other options passed on to 
 +        computehrv (if 8th output is requested), with .hrvrfreq being 
 +        set to .resfreq</file>
  
 ===== Usage overview ===== ===== Usage overview =====
heartbeats.1276558408.txt.gz · Last modified: 2010/06/14 23:33 by jochen