[FieldTrip] fft_timelockgrandaverage

[Zizlsperger Leopold]

Dear Steve
thanks for your reply. I think that solves my problem.
(I tried that already, but always got 
"??? Improper index matrix reference"
but looks like I have to look closer again into the rest of the script, seems to be a problem with the clusters themselves).
Thanks for your help
Best
Leo


On 22.09.2011, at 15:48, Stephen Politzer-Ahles wrote:

> Leopold,
> 
> The way I dealt with this was by running ft_timelockgrandaverage() twice, once with keepindividual='yes' and once with keepindividual='no', and I saved the structures under different names (i.e., 'condition1_grandindividuals' and 'condition1_grandonly'). I used the former one for cluster statistics, and the latter one (which has the .avg field) for plotting. 
> 
> Alternatively, for each grand average structure with individuals you could just create an .avg field by running the following:
> 
> GA.avg = squeeze( mean(GA.individual,1) );
> 
> This should average across individuals.
> 
> Best,
> Steve Politzer-Ahles
> 
> 
> 
> Message: 2
> Date: Thu, 22 Sep 2011 14:49:14 +0200
> From: Zizlsperger Leopold <zizlsperger at gmail.com>
> To: fieldtrip at donders.ru.nl
> Subject: [FieldTrip] ft_timelockgrandaverage
> Message-ID: <058344EB-FCDD-42FB-8A60-E70A339F35F2 at gmail.com>
> Content-Type: text/plain; charset=us-ascii
> 
> Dear Fieldtrippers,
> 
> in a within-subjects design I use ft_timelockgrandaverage with cfg.keepindividual = 'yes' to average timelocked EEG data (10 subjects) of the form:
> 
>  avg: [29x5000 double]
>          var: [29x5000 double]
>         time: [1x5000 double]
>          dof: [29x5000 double]
>        label: {29x1 cell}
>        trial: [172x29x5000 double]
>       dimord: 'rpt_chan_time'
>    trialinfo: [172x28 double]
>          cfg: [1x1 struct]
> 
> I stick closely to the FieldTrip tutorial for cluster permutation statistics. I use the newest version of fieldtrip. After the grandaverage there is no more 'avg' in the structure, so I can not go on in the tutorial e.g. with:
> GA_XvsY = GA_X;
> GA_XvsY.avg = GA_X.avg - GA_Y.avg;
> 
> New data is of structure:
> 
> label: {29x1 cell}
>          time: [1x5000 double]
>    individual: [10x29x5000 double]
>        dimord: 'subj_chan_time'
>           cfg: [1x1 struct]
> 
> Do I get the tutorial wrong or is it my data ?
> Thanks in advance
> Best
> Leopold
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