# mtspectrumtrigc

## PURPOSE

Multi-taper event triggered time-frequency spectrum - continuous process

## SYNOPSIS

function [S,f,Serr]=mtspectrumtrigc(data,E,win,params)

## DESCRIPTION

     Multi-taper event triggered time-frequency spectrum - continuous process

     Usage:

     [S,f,Serr]=mtspectrumtrigc(data,E,win,params)
     Input:
     Note units have to be consistent. See chronux.m for more information.
           data        (single channel) -- required
           E           (event times) -- required
           win         (in the form [winl winr] i.e window around each event
                                                     required)
                                                     Note that units here have
                                                     to be consistent with
                                                     units of Fs
           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) - optional. Default 0
     Output:
           S       (triggered spectrum in form frequency x events for trialave=0 -
                   or as a function of frequency for trialave=1)
           f       (frequencies)
           Serr    (error bars) only for err(1)>=1

## CROSS-REFERENCE INFORMATION

This function calls:

- createdatamatc Helper function to create an event triggered matrix from univariate
- mtspectrumc Multi-taper spectrum - continuous process
- change_row_to_column Helper routine to transform 1d arrays into column vectors that are needed
- getparams Helper function to convert structure params to variables used by the

This function is called by:

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

## SOURCE CODE

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