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rmlinesc

PURPOSE ^

removes significant sine waves from data (continuous data).

SYNOPSIS ^

function data=rmlinesc(data,params, p)

DESCRIPTION ^

 removes significant sine waves from data (continuous data).

 Usage: data=rmlinesc(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) - 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 (95% confidence).


  Outputs: 
       data        (data with significant lines removed)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function data=rmlinesc(data,params, p)
0002 % removes significant sine waves from data (continuous data).
0003 %
0004 % Usage: data=rmlinesc(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) - 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 (95% confidence).
0021 %
0022 %
0023 %  Outputs:
0024 %       data        (data with significant lines removed)
0025 %
0026 
0027 [N,C]=size(data);
0028 if nargin < 2 || isempty(params); params=[]; end;
0029 [tapers,pad,Fs,fpass,err,trialave,params]=getparams(params);
0030 if nargin<3;p=0.05;end;
0031 params.tapers=dpsschk(tapers,N,Fs); % calculate the tapers
0032 [Fval,A,f,sig] = ftestc(data,params,p);
0033 fmax=findpeaks(Fval,sig);
0034 for ch=1:C;
0035     fsig=f(fmax(ch).loc);
0036     Nf=length(fsig);
0037     fprintf('The significant lines for channel %d and the amplitudes are \n',ch);
0038     for nf=1:Nf;
0039         fprintf('%12.8f\n',fsig(nf));
0040         fprintf('%12.8f\n',real(A(fmax(ch).loc,ch)));
0041         fprintf('%12.8f\n',imag(A(fmax(ch).loc,ch)));
0042     end;
0043     datasine(:,ch)=exp(i*2*pi*(1:N)'*fsig/Fs)*A(fmax(ch).loc,ch)+exp(-i*2*pi*(1:N)'*fsig/Fs)*conj(A(fmax(ch).loc,ch));
0044 end;
0045 datan=data-datasine;
0046 if nargout==0; 
0047    figure;subplot(211); plot(f,Fval); line(get(gca,'xlim'),[sig sig]);
0048    px1=pmtm(data(:,1));
0049    px2=pmtm(datan(:,1));
0050    subplot(212);plot(1:length(px1),10*log10(px1),1:length(px2),10*log10(px2));
0051 end;
0052 data=datan;

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