mtspectrumtrigpt

PURPOSE ^

Multi-taper time-frequency spectrum - point process times

SYNOPSIS ^

function [S,f,R,Serr]=mtspectrumtrigpt(data,E,win,params,fscorr)

DESCRIPTION ^

 Multi-taper time-frequency spectrum - point process times

 Usage:

 [S,f,R,Serr]=mtspectrumtrigpt(data,E,win,params,fscorr)
 Input: 
       data        (structure array of one channel of spike times; 
                   also accepts 1d column vector of spike times) -- required
       E           (event times) - required
       win         (in the form [winl winr] i.e window around each event)--
                                                 required
       params: structure with fields tapers, pad, Fs, fpass, err, trialave
       - optional
           tapers : precalculated tapers from dpss or in the one of the following
                    forms: 
                   (1) A numeric vector [TW K] where TW is the
                       time-bandwidth product and K is the number of
                       tapers to be used (less than or equal to
                       2TW-1). 
                   (2) A numeric vector [W T p] where W is the
                       bandwidth, T is the duration of the data and p 
                       is an integer such that 2TW-p tapers are used. In
                       this form there is no default i.e. to specify
                       the bandwidth, you have to specify T and p as
                       well. Note that the units of W and T have to be
                       consistent: if W is in Hz, T must be in seconds
                       and vice versa. Note that these units must also
                       be consistent with the units of params.Fs: W can
                       be in Hz if and only if params.Fs is in Hz.
                       The default is to use form 1 with TW=3 and K=5

            pad            (padding factor for the FFT) - optional (can take values -1,0,1,2...). 
                    -1 corresponds to no padding, 0 corresponds to padding
                    to the next highest power of 2 etc.
                       e.g. For N = 500, if PAD = -1, we do not pad; if PAD = 0, we pad the FFT
                       to 512 points, if pad=1, we pad to 1024 points etc.
                       Defaults to 0.
           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 events when 1, don't average when 0) -
           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       (triggered spectrum in form frequency x events if trialave=0; 
               function of frequency if trialave=1)
       f       (frequencies)
       R       (spike rate)
       Serr    (error bars) - only for err(1)>=1

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [S,f,R,Serr]=mtspectrumtrigpt(data,E,win,params,fscorr)
0002 % Multi-taper time-frequency spectrum - point process times
0003 %
0004 % Usage:
0005 %
0006 % [S,f,R,Serr]=mtspectrumtrigpt(data,E,win,params,fscorr)
0007 % Input:
0008 %       data        (structure array of one channel of spike times;
0009 %                   also accepts 1d column vector of spike times) -- required
0010 %       E           (event times) - required
0011 %       win         (in the form [winl winr] i.e window around each event)--
0012 %                                                 required
0013 %       params: structure with fields tapers, pad, Fs, fpass, err, trialave
0014 %       - optional
0015 %           tapers : precalculated tapers from dpss or in the one of the following
0016 %                    forms:
0017 %                   (1) A numeric vector [TW K] where TW is the
0018 %                       time-bandwidth product and K is the number of
0019 %                       tapers to be used (less than or equal to
0020 %                       2TW-1).
0021 %                   (2) A numeric vector [W T p] where W is the
0022 %                       bandwidth, T is the duration of the data and p
0023 %                       is an integer such that 2TW-p tapers are used. In
0024 %                       this form there is no default i.e. to specify
0025 %                       the bandwidth, you have to specify T and p as
0026 %                       well. Note that the units of W and T have to be
0027 %                       consistent: if W is in Hz, T must be in seconds
0028 %                       and vice versa. Note that these units must also
0029 %                       be consistent with the units of params.Fs: W can
0030 %                       be in Hz if and only if params.Fs is in Hz.
0031 %                       The default is to use form 1 with TW=3 and K=5
0032 %
0033 %            pad            (padding factor for the FFT) - optional (can take values -1,0,1,2...).
0034 %                    -1 corresponds to no padding, 0 corresponds to padding
0035 %                    to the next highest power of 2 etc.
0036 %                       e.g. For N = 500, if PAD = -1, we do not pad; if PAD = 0, we pad the FFT
0037 %                       to 512 points, if pad=1, we pad to 1024 points etc.
0038 %                       Defaults to 0.
0039 %           Fs   (sampling frequency) - optional. Default 1.
0040 %           fpass    (frequency band to be used in the calculation in the form
0041 %                                   [fmin fmax])- optional.
0042 %                                   Default all frequencies between 0 and Fs/2
0043 %           err  (error calculation [1 p] - Theoretical error bars; [2 p] - Jackknife error bars
0044 %                                   [0 p] or 0 - no error bars) - optional. Default 0.
0045 %           trialave (average over events when 1, don't average when 0) -
0046 %           default 0
0047 %       fscorr   (finite size corrections, 0 (don't use finite size corrections) or
0048 %                1 (use finite size corrections) - optional
0049 %                (available only for spikes). Defaults 0.
0050 %
0051 % Output:
0052 %       S       (triggered spectrum in form frequency x events if trialave=0;
0053 %               function of frequency if trialave=1)
0054 %       f       (frequencies)
0055 %       R       (spike rate)
0056 %       Serr    (error bars) - only for err(1)>=1
0057 
0058 if nargin < 3; error('Need data, events and window parameters'); end;
0059 if nargin < 2; params=[]; end;
0060 [tapers,pad,Fs,fpass,err,trialave,params]=getparams(params);
0061 clear tapers pad Fs fpass trialave
0062 if nargin < 5 || isempty(fscorr); fscorr=0; end;
0063 if nargout > 3 && err(1)==0; error('Cannot compute errors if err(1)=0'); end;
0064 data=createdatamatpt(data,E,win);
0065 if nargout==4; 
0066     [S,f,R,Serr]=mtspectrumpt(data,params,fscorr);
0067 else
0068     [S,f,R]=mtspectrumpt(data,params,fscorr);
0069 end;

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