[FieldTrip] ICA problem

[Kathrin Müsch]

Hi Qi,

This error message pops up recently with many ft_functions after ICA and is due to some updates. I don't know with which FieldTrip version it started. After ICA component rejection, the number of gradiometers seems to change and this error message pops up. As a workaround, you can either remove the grad field if you don't need it for your analysis at hand or you can load the grad structure from a processing step before the ICA.

Hope that helps,
Kathrin

Am 13.03.2012 um 18:10 schrieb qi li:

> Hi there,
> 
> I am having trouble to prepare neighbors of the channels after I do
> the ICA with the following commands,
> 
> cfg            = [];
> cfg.method = 'runica';
> cfg.runica.pca=64;
> comp           = ft_componentanalysis(cfg, datas)
> 
> Then I remove the bad components by
> 
> cfg=[];
> cfg.component=[2 5];
> data_c=ft_rejectcomponent(cfg,comp_o);
> 
> now I want to prepare the neighbors
> cfg=[];
> cfg.neighbours = ft_prepare_neighbours(cfg, data_c);
> 
> I have the following error message,
> 
> 'undoing the invcomp balancing
> Index exceeds matrix dimensions.
> 
> Error in undobalancing (line 25)
>      tra3(iy,iy) = (eye(numel(ix))+tmp(ix,ix))*tra1(iy,iy);
> 
> Error in channelposition (line 39)
> sens = undobalancing(sens);
> 
> Error in ft_datatype_sens (line 95)
>        [chanpos, chanori, chanlab] = channelposition(sens, 'channel', 'all');
> 
> Error in ft_datatype_raw (line 95)
>      data.grad = ft_datatype_sens(data.grad);
> 
> Error in ft_checkdata (line 177)
>  data = ft_datatype_raw(data, 'hassampleinfo', hassampleinfo);
> 
> Error in ft_prepare_neighbours (line 84)
> if hasdata, data = ft_checkdata(data); end'.
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