


fits significant sine waves to data (continuous data).
Usage: [datafit,Amps,freqs]=fitlinesc(data,params, p)
Inputs:
Note that units of Fs, fpass have to be consistent.
data (data in [N,C] i.e. time x channels/trials or a single vector) - required.
params structure containing parameters - params has the
following fields: tapers, Fs, fpass, pad
tapers (parameters for calculating tapers [NW,K]) - optional. Defaults to [3 5]
Fs (sampling frequency) -- optional. Defaults to 1.
fpass (frequency band to be used in the calculation in the form
[fmin fmax])- optional.
Default all frequencies between 0 and Fs/2
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.
p (P-value to calculate error bars for) - optional. Defaults to 0.05/N where N is data length.
plt (y/n for plot and no plot respectively)
Outputs:
datafit (linear superposition of fitted sine waves)
Amps (amplitudes at significant frequencies)
freqs (significant frequencies)

0001 function [datafit,Amps,freqs]=fitlinesc(data,params, p,plt) 0002 % fits significant sine waves to data (continuous data). 0003 % 0004 % Usage: [datafit,Amps,freqs]=fitlinesc(data,params, p) 0005 % 0006 % Inputs: 0007 % Note that units of Fs, fpass have to be consistent. 0008 % data (data in [N,C] i.e. time x channels/trials or a single vector) - required. 0009 % params structure containing parameters - params has the 0010 % following fields: tapers, Fs, fpass, pad 0011 % tapers (parameters for calculating tapers [NW,K]) - optional. Defaults to [3 5] 0012 % Fs (sampling frequency) -- optional. Defaults to 1. 0013 % fpass (frequency band to be used in the calculation in the form 0014 % [fmin fmax])- optional. 0015 % Default all frequencies between 0 and Fs/2 0016 % pad (padding factor for the FFT) - optional. Defaults to 0. 0017 % e.g. For N = 500, if PAD = 0, we pad the FFT 0018 % to 512 points; if PAD = 2, we pad the FFT 0019 % to 2048 points, etc. 0020 % p (P-value to calculate error bars for) - optional. Defaults to 0.05/N where N is data length. 0021 % plt (y/n for plot and no plot respectively) 0022 % 0023 % 0024 % Outputs: 0025 % datafit (linear superposition of fitted sine waves) 0026 % Amps (amplitudes at significant frequencies) 0027 % freqs (significant frequencies) 0028 % 0029 data=change_row_to_column(data); 0030 [N,C]=size(data); 0031 if nargin < 2 || isempty(params); params=[]; end; 0032 [tapers,pad,Fs,fpass,err,trialave,params]=getparams(params); 0033 clear pad fpass err trialave 0034 if nargin<3;p=0.05/N;end; 0035 params.tapers=dpsschk(tapers,N,Fs); % calculate the tapers 0036 [Fval,A,f,sig] = ftestc(data,params,p,plt); 0037 fmax=findpeaks(Fval,sig); 0038 freqs=cell(1,C); 0039 Amps=cell(1,C); 0040 datafit=data; 0041 for ch=1:C; 0042 fsig=f(fmax(ch).loc); 0043 freqs{ch}=fsig; 0044 Amps{ch}=A(fmax(ch).loc,ch); 0045 Nf=length(fsig); 0046 fprintf('The significant lines for channel %d and the amplitudes are \n',ch); 0047 for nf=1:Nf; 0048 fprintf('%12.8f\n',fsig(nf)); 0049 fprintf('%12.8f\n',real(A(fmax(ch).loc(nf),ch))); 0050 fprintf('%12.8f\n',imag(A(fmax(ch).loc(nf),ch))); 0051 fprintf('\n'); 0052 end; 0053 datafit(:,ch)=exp(i*2*pi*(0:N-1)'*fsig/Fs)*A(fmax(ch).loc,ch)+exp(-i*2*pi*(0:N-1)'*fsig/Fs)*conj(A(fmax(ch).loc,ch)); 0054 end;