clusterstats empty cfg.neighbours, cfg.neighbours example

[Roemer van der Meij]

Hi Andrea,

For a quick work-around the first bullet-point should work out fine, I
don't know why you want to edit cfg.channel though.
However, if you /do/ want to cluster over channels it is necessary to
specify a neighbourhood structure, see ft_neighbourselection for how to
do that. The neighbourhood structure you create by doing this should be
placed in cfg.neighbours. The result could be the same if you edit the
cfg options in the subfunction clusterstat though, but I haven't used
those fields directly.

Hope this helps,
Kind regards,
Roemer



On 3/4/2010 11:27 AM, Andrea Ostendorf wrote:
> Dear Roemer,
>
> regarding your reply to Chetan's question / observation: Can I ask you
> whether what I currently do is correct?
> I have got time-frequency data, which I sometimes want to cluster over
> channels or not. So I do the following
>
> o) do the modification you recommended to Chetan
>        channeighbstructmat = makechanneighbstructmat(cfg);
>    	issource = 0;
> 	(commented out the surrounding lines)
> o) edit cfg.channel
> o) if clustering over channels is desired:
> 	edit cfg.neighbourdist and cfg.minnbchan
>     else (no clustering over channels or if channels are averaged):
> 	cfg.neighbours = {}
>
> This works and there is a marked difference whether I cluster over channels
> or not.
> I am just not sure whether it is correct.
> Thanks a lot for your help so far!
>
> All the best
> Andrea
>
> ----------------------------------
> 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/neuroimaging/fieldtrip.
>

--
Roemer van der Meij MSc
Scientific Programmer&  Data-Analyst
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognition
P.O. Box 9104
6500 HE Nijmegen
The Netherlands
Tel: +31(0)24 3612631
E-mail: r.vandermeij at donders.ru.nl


----------------------------------
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/neuroimaging/fieldtrip.
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