


Multi-taper spectrum - binned point process
Usage:
[S,f,R,Serr]=mtspectrumpb(data,tapers,pad,Fs,fpass,err,trialave,fscorr)
Input:
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 (binning 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
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:
S (spectrum in form frequency x channels/trials)
f (frequencies)
R (spike rate)
Serr (error bars)

0001 function [S,f,R,Serr]=mtspectrumpb(data,tapers,pad,Fs,fpass,err,trialave,fscorr) 0002 % Multi-taper spectrum - binned point process 0003 % 0004 % Usage: 0005 % 0006 % [S,f,R,Serr]=mtspectrumpb(data,tapers,pad,Fs,fpass,err,trialave,fscorr) 0007 % Input: 0008 % data (in form samples x channels/trials) -- required 0009 % tapers (precalculated tapers from dpss, or in the form [NW K] e.g [3 5]) -- optional. If not 0010 % specified, use [NW K]=[3 5] 0011 % pad (padding factor for the FFT) - optional. Defaults to 0. 0012 % e.g. For N = 500, if PAD = 0, we pad the FFT 0013 % to 512 points; if PAD = 2, we pad the FFT 0014 % to 2048 points, etc. 0015 % Fs (binning frequency) - optional. Default 1. 0016 % fpass (frequency band to be used in the calculation in the form 0017 % [fmin fmax])- optional. 0018 % Default all frequencies between 0 and Fs/2 0019 % err (error calculation [1 p] - Theoretical error bars; [2 p] Jackknife error bars, 0020 % [0 p] or 0 - no error bars) - optional. Default 0. 0021 % trialave (average over trials when 1, don't average when 0) - optional. Default 0 0022 % fscorr (finite size corrections, 0 (don't use finite size corrections) or 1 (use finite size corrections) - optional 0023 % (available only for spikes). Defaults 0. 0024 % Output: 0025 % S (spectrum in form frequency x channels/trials) 0026 % f (frequencies) 0027 % R (spike rate) 0028 % Serr (error bars) 0029 0030 if nargin < 1; error('Need data'); end; 0031 if nargin < 2; tapers=[3 5]; end; 0032 if nargin < 3; pad=0;end; 0033 if nargin < 4; Fs=1; end; 0034 if nargin < 5; fpass=[0 Fs/2]; end; 0035 if nargin < 6; err=0; end; 0036 if nargin < 7; trialave=0; end; 0037 if nargin < 8; fscorr=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 if isempty(trialave); trialave=0;end; 0044 if isempty(fscorr);fscorr=0;end; 0045 0046 0047 [N,C]=size(data); 0048 nfft=2^(nextpow2(N)+pad); 0049 [f,findx]=getfgrid(Fs,nfft,fpass); 0050 0051 tapers=dpsschk(tapers,N)*sqrt(Fs); % check tapers 0052 [J,Msp,Nsp]=mtfftpb(data,tapers,nfft); 0053 J=J(findx,:,:); 0054 S=squeeze(mean(conj(J).*J,2)); 0055 if trialave; S=squeeze(mean(S,2)); Msp=mean(Msp);end; 0056 R=Msp*Fs; 0057 if nargout==4; 0058 if fscorr==1; 0059 Serr=specerr(S,J,err,trialave,Nsp); 0060 else; 0061 Serr=specerr(S,J,err,trialave); 0062 end; 0063 end;