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- function J=mtfftc(data,tapers,nfft,Fs)
- % Multi-taper fourier transform - continuous data
- %
- % Usage:
- % J=mtfftc(data,tapers,nfft,Fs) - all arguments required
- % Input:
- % data (in form samples x channels/trials or a single vector)
- % tapers (precalculated tapers from dpss)
- % nfft (length of padded data)
- % Fs (sampling frequency)
- %
- % Output:
- % J (fft in form frequency index x taper index x channels/trials)
- if nargin < 4; error('Need all input arguments'); end;
- data=change_row_to_column(data);
- [NC,C]=size(data); % size of data
- [NK K]=size(tapers); % size of tapers
- if NK~=NC; error('length of tapers is incompatible with length of data'); end;
- tapers=tapers(:,:,ones(1,C)); % add channel indices to tapers
- data=data(:,:,ones(1,K)); % add taper indices to data
- data=permute(data,[1 3 2]); % reshape data to get dimensions to match those of tapers
- data_proj=data.*tapers; % product of data with tapers
- J=fft(data_proj,nfft)/Fs; % fft of projected data
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