cohmatrixc

PURPOSE ^

Multi-taper coherency matrix - continuous process

SYNOPSIS ^

function [C,phi,f,confC,phierr,Cerr]=cohmatrixc(data,tapers,pad,Fs,fpass,err)

DESCRIPTION ^

 Multi-taper coherency matrix - continuous process

 Usage:

 [C,phi,f,confC,phierr,Cerr]=cohmatrixc(data,tapers,pad,Fs,fpass,err)
 Input: 
 Note units have to be consistent. See chronux.m for more information.
       data (in form samples x channels/trials) -- required
       tapers (precalculated tapers from dpss, or in the form [NW K] e.g [3 5]) -- optional. If not 
                                                 specified, use [NW K]=[3 5]
        pad            (padding factor for the FFT) - optional. Defaults to 0.  
                       e.g. For N = 500, if PAD = 0, we pad the FFT 
                       to 512 points; if PAD = 2, we pad the FFT
                       to 2048 points, etc.
       Fs   (sampling frequency) - optional. Default 1.
       fpass    (frequency band to be used in the calculation in the form
                                   [fmin fmax])- optional. 
                                   Default all frequencies between 0 and Fs/2
       err  (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars
                                   [0 p] or 0 - no error bars) - optional. Default 0.
 Output:
       C (abs of coherency frequency x channels/trials)
       phi (phase of coherency frequency x channels/trials)
       f (frequencies)
       confC (confidence level for c at 1-p %)
       phierr (error bars for phi)
       Cerr  (error bars for C)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [C,phi,f,confC,phierr,Cerr]=cohmatrixc(data,tapers,pad,Fs,fpass,err)
0002 % Multi-taper coherency matrix - continuous process
0003 %
0004 % Usage:
0005 %
0006 % [C,phi,f,confC,phierr,Cerr]=cohmatrixc(data,tapers,pad,Fs,fpass,err)
0007 % Input:
0008 % Note units have to be consistent. See chronux.m for more information.
0009 %       data (in form samples x channels/trials) -- required
0010 %       tapers (precalculated tapers from dpss, or in the form [NW K] e.g [3 5]) -- optional. If not
0011 %                                                 specified, use [NW K]=[3 5]
0012 %        pad            (padding factor for the FFT) - optional. Defaults to 0.
0013 %                       e.g. For N = 500, if PAD = 0, we pad the FFT
0014 %                       to 512 points; if PAD = 2, we pad the FFT
0015 %                       to 2048 points, etc.
0016 %       Fs   (sampling frequency) - optional. Default 1.
0017 %       fpass    (frequency band to be used in the calculation in the form
0018 %                                   [fmin fmax])- optional.
0019 %                                   Default all frequencies between 0 and Fs/2
0020 %       err  (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars
0021 %                                   [0 p] or 0 - no error bars) - optional. Default 0.
0022 % Output:
0023 %       C (abs of coherency frequency x channels/trials)
0024 %       phi (phase of coherency frequency x channels/trials)
0025 %       f (frequencies)
0026 %       confC (confidence level for c at 1-p %)
0027 %       phierr (error bars for phi)
0028 %       Cerr  (error bars for C)
0029 
0030 [N,Ch]=size(data);
0031 if Ch==1; error('Need at least two channels of data'); end;
0032 if nargin < 2; tapers=[3 5]; end;
0033 if nargin < 3;pad=0;end;
0034 if nargin < 4; Fs=1; end;
0035 if nargin < 5; fpass=[0 Fs/2]; end;
0036 if nargin < 6; err=0; end;
0037 if isempty(tapers); tapers=[3 5]; end;
0038 if isempty(pad);pad=0;end;
0039 if isempty(Fs); Fs=1; end;
0040 if isempty(fpass); fpass=[0 Fs/2]; end;
0041 if isempty(err); err=0; end;
0042 
0043 nfft=2^(nextpow2(N)+pad);
0044 [f,findx]=getfgrid(Fs,nfft,fpass); 
0045 tapers=dpsschk(tapers,N); % check tapers
0046 J=mtfftc(data,tapers,nfft);
0047 J=J(findx,:,:); 
0048 if err(1)==0;
0049      [C,phi]=cohmathelper(J,err);
0050 elseif err(1)==1;
0051      [C,phi,confC,phierr]=cohmathelper(J,err);
0052 elseif err(1)==2;
0053      [C,phi,confC,phierr,Cerr]=cohmathelper(J,err);
0054 end

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