[FieldTrip] tfa produces zeros

[Marcus Heldmann]

I used this code

cfg = [];
cfg.channel    = '1_Fz';	                
cfg.method     = 'wavelet';                
cfg.width      = 7; 
cfg.output     = 'pow';	
cfg.foi        = 1:2:30;	                
cfg.toi        = -0.5:0.05:1.5;		              
TFRwave = ft_freqanalysis(cfg, data_clean);

Thanks, Marcus

---------------------------------------------

Dr. Marcus Heldmann
Klinik für Neurologie
UKSH, Campus Lübeck
Paul-Ehrlich-Strasse 1-3, MGZ
23562 Lübeck
0451 317 9313 14




Am 19.11.2014 um 10:12 schrieb kousik sarathy <sarathykousik at gmail.com>:

> Dear Marcus,
> 
> I tried running the "data_clean" through the same snippet of code (IV). It works fine for me.
> 
> Could post the exact code you used? 
> 
> --
> Regards,
> Kousik Sarathy, S
> 
> 
> On Wed, Nov 19, 2014 at 9:58 AM, Marcus Heldmann <marcus.heldmann at neuro.uni-luebeck.de> wrote:
> Dear all,
> I have a dataset with surface and local field potential recordings and I’d like to perform a tfa. The data are recorded with a BrainVision Recorder, 1KHz sampling frequency, bp 0.05-200Hz. After epoching (-1 to 2 s), filtering (bsfilter 49:51, lpfilter 70) and baseline correction I tried to perform a tfa using a wavelet analysis described in the tutorial (http://fieldtrip.fcdonders.nl/tutorial/timefrequencyanalysis, Time-frequency analysis IV). However, the powspctrm-field just contains NaNs (which is ok) and zeros (not ok). The data seem to be correct, I am able to plot single trials. The strange thing is, that my EEGLAB analysis provides some meaningful results. You can fined the preprocessed data for one condition under the following link
> 
> https://drive.google.com/file/d/0B4-NxS-suG8dOXZnVHcxUDFyYXM/view?usp=sharing
> 
> Any idea, why this happen’s?
> 
> Greetings, Marcus
> 
> ---------------------------------------------
> 
> Dr. Marcus Heldmann
> Klinik für Neurologie
> UKSH, Campus Lübeck
> Paul-Ehrlich-Strasse 1-3, MGZ
> 23562 Lübeck
> 0451 317 9313 14
> 
> 
> 
> 
> 
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