


Multi-taper spectrum - continuous process
Usage:
[S,f,Serr]=mtspectrumc(data,tapers,pad,Fs,fpass,err,trialave)
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.
trialave (average over trials when 1, don't average when 0) - optional. Default 0
Output:
S (spectrum in form frequency x channels/trials)
f (frequencies)
Serr (error bars)

0001 function [S,f,Serr]=mtspectrumc(data,tapers,pad,Fs,fpass,err,trialave) 0002 % Multi-taper spectrum - continuous process 0003 % 0004 % Usage: 0005 % 0006 % [S,f,Serr]=mtspectrumc(data,tapers,pad,Fs,fpass,err,trialave) 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 % trialave (average over trials when 1, don't average when 0) - optional. Default 0 0023 % Output: 0024 % S (spectrum in form frequency x channels/trials) 0025 % f (frequencies) 0026 % Serr (error bars) 0027 0028 if nargin < 1; error('Need data'); end; 0029 if nargin < 2; tapers=[3 5]; end; 0030 if nargin < 3;pad=0;end; 0031 if nargin < 4; Fs=1; end; 0032 if nargin < 5; fpass=[0 Fs/2]; end; 0033 if nargin < 6; err=0; end; 0034 if nargin < 7; trialave=0; end; 0035 if isempty(tapers); tapers=[3 5]; end; 0036 if isempty(pad);pad=0;end; 0037 if isempty(Fs); Fs=1; end; 0038 if isempty(fpass); fpass=[0 Fs/2]; end; 0039 if isempty(err); err=0; end; 0040 if isempty(trialave); trialave=0;end; 0041 0042 [N,C]=size(data); 0043 nfft=2^(nextpow2(N)+pad); 0044 [f,findx]=getfgrid(Fs,nfft,fpass); 0045 tapers=dpsschk(tapers,N)/sqrt(Fs); % check tapers 0046 J=mtfftc(data,tapers,nfft); 0047 J=J(findx,:,:); 0048 S=squeeze(mean(conj(J).*J,2)); 0049 if trialave; S=squeeze(mean(S,2));end; 0050 if nargout==3; 0051 Serr=specerr(S,J,err,trialave); 0052 end;