mtspecgrampt

PURPOSE ^

Multi-taper time-frequency spectrum - point process times

SYNOPSIS ^

function [S,t,f,R,Serr]=mtspecgrampt(data,movingwin,tapers,pad,Fs,fpass,err,trialave,fscorr)

DESCRIPTION ^

 Multi-taper time-frequency spectrum - point process times

 Usage:

 [S,t,f,Serr]=mtspectgrampt(data,movingwin,tapers,pad,Fs,fpass,err,trialave,fscorr)
 Input: 
       data        (structure array of spike times for each channel; also accepts 1d column vector of spike times) -- required
       movingwin         (in the form [window,winstep] i.e length of moving
                                                 window and step size.
                                                 
       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 for fft grid used to calculate fft of prolates. 1/Fs is the time between consecutive
                                   points on the grid used for evaluation of the prolates) - 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.

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [S,t,f,R,Serr]=mtspecgrampt(data,movingwin,tapers,pad,Fs,fpass,err,trialave,fscorr)
0002 % Multi-taper time-frequency spectrum - point process times
0003 %
0004 % Usage:
0005 %
0006 % [S,t,f,Serr]=mtspectgrampt(data,movingwin,tapers,pad,Fs,fpass,err,trialave,fscorr)
0007 % Input:
0008 %       data        (structure array of spike times for each channel; also accepts 1d column vector of spike times) -- required
0009 %       movingwin         (in the form [window,winstep] i.e length of moving
0010 %                                                 window and step size.
0011 %
0012 %       tapers      (precalculated tapers from dpss, or in the form [NW K] e.g [3 5]) -- optional. If not
0013 %                                                 specified, use [NW K]=[3 5]
0014 %        pad            (padding factor for the FFT) - optional. Defaults to 0.
0015 %                         e.g. For N = 500, if PAD = 0, we pad the FFT
0016 %                         to 512 points; if PAD = 2, we pad the FFT
0017 %                         to 2048 points, etc.
0018 %       Fs          (binning frequency for fft grid used to calculate fft of prolates. 1/Fs is the time between consecutive
0019 %                                   points on the grid used for evaluation of the prolates) - optional. Default 1.
0020 %       fpass       (frequency band to be used in the calculation in the form
0021 %                                   [fmin fmax])- optional.
0022 %                                   Default all frequencies between 0 and Fs/2
0023 %       err         (error calculation [1 p] - Theoretical error bars; [2 p] Jackknife error bars,
0024 %                                   [0 p] or 0 - no error bars) - optional. Default 0.
0025 %       trialave    (average over trials when 1, don't average when 0) - optional. Default 0
0026 %       fscorr   (finite size corrections, 0 (don't use finite size corrections) or 1 (use finite size corrections) - optional
0027 %                (available only for spikes). Defaults 0.
0028 
0029 % Output:
0030 %       S       (spectrum in form time x frequency x channels/trials)
0031 %       t       (times)
0032 %       f       (frequencies)
0033 %       Serr    (error bars)
0034 
0035 if nargin < 2; error('Need data and window parameters'); end;
0036 if nargin < 3; tapers=[3 5]; end;
0037 if nargin < 4;pad=0;end;
0038 if nargin < 5; Fs=1; end;
0039 if nargin < 6; fpass=[0 Fs/2]; end;
0040 if nargin < 7; err=0; end;
0041 if nargin < 8; trialave=0; end;
0042 if nargin < 9; fscorr=0; end;
0043 if isempty(tapers); tapers=[3 5]; end;
0044 if isempty(pad);pad=0;end;
0045 if isempty(Fs); Fs=1; end;
0046 if isempty(fpass); fpass=[0 Fs/2]; end;
0047 if isempty(err); err=0; end;
0048 if isempty(trialave); trialave=0;end;
0049 if isempty(fscorr);fscorr=0;end
0050 
0051 [mintime,maxtime]=minmaxsptimes(data);
0052 tn=[mintime+movingwin(1)/2:movingwin(2):maxtime-movingwin(1)/2];
0053 Nwin=round(Fs*movingwin(1)); % number of samples in window
0054 Nstep=round(movingwin(2)*Fs); % number of samples to step through
0055 nfft=2^(nextpow2(Nwin)+pad);
0056 [f,findx]=getfgrid(Fs,nfft,fpass); 
0057 tapers=dpsschk(tapers,Nwin)/sqrt(Fs); % check tapers
0058 nw=length(tn);
0059 for n=1:nw;
0060    t=linspace(tn(n)-movingwin(1)/2,tn(n)+movingwin(1)/2,Nwin);
0061    datawin=extractspdata(data,[t(1) t(end)]);
0062    if nargout==5;
0063      [s,f,r,serr]=mtspectrumpt(datawin,tapers,pad,Fs,fpass,err,trialave,fscorr,t);
0064      Serr(1,n,:,:)=squeeze(serr(1,:,:));
0065      Serr(2,n,:,:)=squeeze(serr(2,:,:));
0066    else;
0067      [s,f,r]=mtspectrumpt(datawin,tapers,pad,Fs,fpass,err,trialave,fscorr,t);
0068    end;
0069    S(n,:,:)=s;
0070    R(n,:)=r;
0071 end;
0072 t=tn;
0073 S=squeeze(S); R=squeeze(R); if nargout==5; Serr=squeeze(Serr);end

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