[FieldTrip] Calculating the cross spectral density matrix
陈雪
mengtongxiao at gmail.com
Mon Mar 11 08:45:48 CET 2013
Dear all:
I calculate the cross spectral density matrix and my data from
rest. I want do beta-band activity(14-30Hz).so I use a center frequency of
about 22 Hz.we select a time window of 0.5s.I do this as follow:
cfg = [];
cfg.toilim = [0.5 1];
dataP = ft_redefinetrial(cfg, data_org);
cfg = [];
cfg.method = 'mtmfft';
cfg.output = 'powandcsd';
cfg.tapsmofrq = 8;
cfg.foilim = [22 22];
freqP = ft_freqanalysis(cfg, dataP);
And i got this wrong message
??? Error using ==> dpss at 45
Time-bandwidth product NW must be less than N/2.
Error in ==> ft_specest_mtmfft>double_dpss at 303
tap = dpss(double(a), double(b), varargin{:});
Error in ==> ft_specest_mtmfft at 115
tap =
double_dpss(ndatsample,ndatsample*(tapsmofrq./fsample))';
Error in ==> ft_freqanalysis at 526
[spectrum,ntaper,foi] = ft_specest_mtmfft(dat, time,
'taper', cfg.taper, options{:}, 'feedback', fbopt);
thanks for your attention.
best,
mengtongxiao
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