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




> -----Ursprüngliche 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!



----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Michael Wibral.vcf
Type: text/x-vcard
Size: 344 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20090302/8145b820/attachment-0001.vcf>


More information about the fieldtrip mailing list