channel selection in timelockanalysis

[Ingrid Nieuwenhuis]

Dear Harald,



It is not fully clear what you are trying to do. I think you mean
timelockGRANDAVERAGE doesn't work when the subjects have different channels?
(First you speak of timelockANALYSIS, but I assume that's a typo?)



I looked into the code and there is an area that deals with the problem when
not all subjects have the same channels (edit timelockgrandaverage: it says
DETERMINE WHICH CHANNELS ARE AVAILABLE FOR ALL SUBJECTS). So I think that
the problem doesn't lie in the fact that your subjects do not have the same
channels. That also explains why you still get an error when you only use
the 'E101' channel.



You could try to find out with the debugger which matrix it is that exceeds
its dimension; it seems that it might have to do with time
ResultsTimeSelectCases



Hop this help you further,

Ingrid



  _____

From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Harald Stoegbauer
Sent: Monday, May 07, 2007 8:56 AM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] channel selection in timelockanalysis



Dear fieldtripper,

'timelockanalysis' works fine when all subjects have exactly the same
electrodes.





When some subjects have 'bad channels' (missing) it doesn't work.



Trying to narrow the channel selection with cfg.channel doesn't seem to
work, too.


(RAB_U_A is a cell which contains serveral subjects datasets)





cfg =[];


cfg.keepindividual = 'no'


cfg.channel={'E101'}
;


RUA = timelockgrandaverage(cfg, RAB_U_A{:});

??? Index exceeds matrix dimensions.

Error in ==> timelockgrandaverage at 125
  avgmat(s, :, :) = varargin{s}.avg(:, ResultsTimeSelectCases);


Thanks,

Harald

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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.
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  http://www.ru.nl/fcdonders/fieldtrip/

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