


Multi-taper coherency matrix - binned point process
Usage:
[C,phi,S12,f,zerosp,confC,phierr,Cerr]=cohmatrixpb(data,params,fscorr)
Input:
data (in form samples x channels) -- required
params: structure with fields tapers, pad, Fs, fpass, err
- optional
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.
fscorr (finite size corrections, 0 (don't use finite size corrections) or 1 (use finite size corrections) - optional
(available only for spikes). Defaults 0.
Output:
C (magnitude 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)
zerosp (1 for channels where no spikes were found, zero otherwise)
confC (confidence level for C at 1-p %) - only for err(1)>=1
phierr (error bars for phi) - only for err(1)>=1
Cerr (Jackknife error bars for C - use only for Jackknife - err(1)=2)

0001 function [C,phi,S12,f,zerosp,confC,phierr,Cerr]=cohmatrixpb(data,params,fscorr) 0002 % Multi-taper coherency matrix - binned point process 0003 % 0004 % Usage: 0005 % 0006 % [C,phi,S12,f,zerosp,confC,phierr,Cerr]=cohmatrixpb(data,params,fscorr) 0007 % Input: 0008 % data (in form samples x channels) -- required 0009 % params: structure with fields tapers, pad, Fs, fpass, err 0010 % - optional 0011 % tapers (precalculated tapers from dpss, or in the form [NW K] e.g [3 5]) -- optional. If not 0012 % specified, use [NW K]=[3 5] 0013 % pad (padding factor for the FFT) - optional. Defaults to 0. 0014 % e.g. For N = 500, if PAD = 0, we pad the FFT 0015 % to 512 points; if PAD = 2, we pad the FFT 0016 % to 2048 points, etc. 0017 % Fs (sampling frequency) - optional. Default 1. 0018 % fpass (frequency band to be used in the calculation in the form 0019 % [fmin fmax])- optional. 0020 % Default all frequencies between 0 and Fs/2 0021 % err (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars 0022 % [0 p] or 0 - no error bars) - optional. Default 0. 0023 % fscorr (finite size corrections, 0 (don't use finite size corrections) or 1 (use finite size corrections) - optional 0024 % (available only for spikes). Defaults 0. 0025 % Output: 0026 % C (magnitude of coherency frequency x channels x channels) 0027 % phi (phase of coherency frequency x channels x channels) 0028 % S12 (cross-spectral matrix frequency x channels x channels) 0029 % f (frequencies) 0030 % zerosp (1 for channels where no spikes were found, zero otherwise) 0031 % confC (confidence level for C at 1-p %) - only for err(1)>=1 0032 % phierr (error bars for phi) - only for err(1)>=1 0033 % Cerr (Jackknife error bars for C - use only for Jackknife - err(1)=2) 0034 0035 [N,Ch]=size(data); 0036 if Ch==1; error('Need at least two channels of data'); end; 0037 if nargin < 2; params=[]; end; 0038 [tapers,pad,Fs,fpass,err,trialave,params]=getparams(params); 0039 if nargin < 3 || isempty(fscorr); fscorr=0; end; 0040 0041 nfft=2^(nextpow2(N)+pad); 0042 [f,findx]=getfgrid(Fs,nfft,fpass); 0043 tapers=dpsschk(tapers,N,Fs); % check tapers 0044 [J,Msp,Nsp]=mtfftpb(data,tapers,nfft); 0045 C1=size(J,3); 0046 zerosp=zeros(1,C1); % initialize the zerosp variable 0047 zerosp(Nsp==0)=0; % set the zerosp variable 0048 J=J(findx,:,:); 0049 if err(1)==0; 0050 [C,phi,S12]=cohmathelper(J,err); 0051 elseif err(1)==1; 0052 if fscorr==0; 0053 [C,phi,S12,confC,phierr]=cohmathelper(J,err); 0054 else 0055 [C,phi,S12,confC,phierr]=cohmathelper(J,err,Nsp); 0056 end; 0057 elseif err(1)==2; 0058 if fscorr==0; 0059 [C,phi,S12,confC,phierr,Cerr]=cohmathelper(J,err); 0060 else 0061 [C,phi,S12,confC,phierr,Cerr]=cohmathelper(J,err,Nsp); 0062 end; 0063 end