# 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:

- getparams Helper function to convert structure params to variables used by the
- createdatamatpt Helper function to create an event triggered matrix from a single
- mtspectrumpt Multi-taper spectrum - point process times

This function is called by:

- testscript function testscript(pname,direction,movingwin,segave,params,fscorr)

## 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;