incomplete CSD Matrix

Michael Wibral wibral at BIC.UNI-FRANKFURT.DE
Mon Mar 2 14:02:17 CET 2009


Hi Frederic,

I suspect that the configuration of channels (electrodes / gradiometers) used for preprocessing the data and computing the CSD matrix is different from the one used in the creation of the grid / headmodel / leadfield. At least I have seen such a setup result in a very similar error.

Michael




> -----Urspr√ľngliche Nachricht-----
> Von: "Frederic Roux" <fredericroux at HOTMAIL.DE>
> Gesendet: 27.02.09 11:02:47
> An: FIELDTRIP at NIC.SURFNET.NL
> Betreff: [FIELDTRIP] incomplete CSD Matrix

Dear fieldtrip users,
> 
> I am running sourceanalysis for different subjects. In 18 of 20
> sujbects everything works out, however for 2 subjects in particular I
> am getting the following error message:
> 
> ???Error using==>fieldtrip-20081208/private/prepare_freq_matrices 
> at201
> 
>  The cross-spectral-density matrix is not complete
> 
> Error in==>sourceanalysis at 723
>  [Cf, Cr, Pr, Ntrials , cfg] = prepare_freq_matrices(cfg, data);
> 
> Error in==>computeLead fields at 105
>  [pressource]= sourceanalysis(cfg,preTFdata);
> 
> I checked the Cf matrix and found out that it contains 2 NaN entries. 
> Does anyone have an idea what this could possibly be related to or 
> what
> I should check my data for? I used exactly the same parameters as for 
> all the other subjects.
> 
> Best,
> 
> Frederic 
> Brand neu: Top Videos auf MSN ClipClub! Schau Dir die besten 
> 
> Playlists an >> Play now!



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