


Multi-taper coherency,cross-spectral matrix - continuous process
Usage:
[C,phi,S12,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) -- 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 x channels)
phi (phase of coherency frequency x channels x channels)
S12 (cross-spectral matrix frequency x channels x channels)
f (frequencies)
confC (confidence level for c at 1-p %)
phierr (error bars for phi)
Cerr (error bars for C)

0001 function [C,phi,S12,f,confC,phierr,Cerr]=cohmatrixc(data,tapers,pad,Fs,fpass,err) 0002 % Multi-taper coherency,cross-spectral matrix - continuous process 0003 % 0004 % Usage: 0005 % 0006 % [C,phi,S12,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) -- 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 x channels) 0024 % phi (phase of coherency frequency x channels x channels) 0025 % S12 (cross-spectral matrix frequency x channels x channels) 0026 % f (frequencies) 0027 % confC (confidence level for c at 1-p %) 0028 % phierr (error bars for phi) 0029 % Cerr (error bars for C) 0030 0031 [N,Ch]=size(data); 0032 if Ch==1; error('Need at least two channels of data'); end; 0033 if nargin < 2; tapers=[3 5]; end; 0034 if nargin < 3;pad=0;end; 0035 if nargin < 4; Fs=1; end; 0036 if nargin < 5; fpass=[0 Fs/2]; end; 0037 if nargin < 6; err=0; end; 0038 if isempty(tapers); tapers=[3 5]; end; 0039 if isempty(pad);pad=0;end; 0040 if isempty(Fs); Fs=1; end; 0041 if isempty(fpass); fpass=[0 Fs/2]; end; 0042 if isempty(err); err=0; end; 0043 0044 nfft=2^(nextpow2(N)+pad); 0045 [f,findx]=getfgrid(Fs,nfft,fpass); 0046 tapers=dpsschk(tapers,N,Fs); % check tapers 0047 J=mtfftc(data,tapers,nfft,Fs); 0048 J=J(findx,:,:); 0049 if err(1)==0; 0050 [C,phi,S12]=cohmathelper(J,err); 0051 elseif err(1)==1; 0052 [C,phi,S12,confC,phierr]=cohmathelper(J,err); 0053 elseif err(1)==2; 0054 [C,phi,S12,confC,phierr,Cerr]=cohmathelper(J,err); 0055 end