[FieldTrip] ft_sourceinterpolate after grandaverage, interpn error

[jan-mathijs schoffelen]

Hi Cornelius,

Could it be that the parameter 'avg.avg.pow' does not work?

Best,

JM

On Jun 22, 2012, at 2:38 PM, cornelius abel wrote:

> Dear Fieldtrip list,
> 
> i successfully beamformed some steady state activity and the sourceplots per subject are looking very nice.
> As a next step I tried to calculate a grand average using ft_sourcegrandaverage:
> 
> cfg=[];
> cfg.keepindividual='no';
> cfg.parameter='avg.pow';
> GACont= ft_sourcegrandaverage(cfg, AllsourceCont{:});
> 
> giving me the following structure:
> 
> GACont =
> pos: [3570x3 double]
> dim: [17 14 15]
> avg: [1x1 struct]
> var: [1x1 struct]
> dimord: 'voxel'
> inside: [1846x1 double]
> outside: [1724x1 double]
> df: [3570x1 double]
> cfg: [1x1 struct]
> 
> but interpolating this onto an anatomy always gives me an error:
> 
> cfg = [];
> cfg.downsample= 2;
> cfg.parameter = 'avg.avg.pow';
> sourceDiffInt= ft_sourceinterpolate(cfg, GACont , mri);
> 
> /??? Error using ==> interpn at 155/
> ///Wrong number of input arguments or some dimension of V is less than 2./
> ///Error in ==> ft_sourceinterpolate>my_interpn at 464/
> ///av(sel) = interpn(fv, ax(sel), ay(sel), az(sel), interpmethod);/
> ///Error in ==> ft_sourceinterpolate at 368/
> ///av( sel) = my_interpn(fv, ax(sel), ay(sel), az(sel), cfg.interpmethod, cfg.feedback);/
> 
> however interpolating a single subject source data works just fine...
> 
> cfg = [];
> cfg.downsample= 2;
> cfg.parameter = 'avg.pow';
> sourceDiffInt= ft_sourceinterpolate(cfg, AllsourceCont{1} , mri);
> 
> 
> What am i doing wrong here, any ideas?
> 
> 
> 
> Greetings, Cornelius
> 
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Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

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