[FieldTrip] ft_read_vol with Neuromag

Robert Oostenveld r.oostenveld at donders.ru.nl
Mon May 23 09:41:17 CEST 2011

Hi Elena

Although some years ago FieldTrip was supporting volume conduction  
models from Neuromag using the meg-pd and the (closed source) meg-calc  
toolboxes from the company itself, I suspect that nobody has been  
using them the last few years. The mex files in meg-pd and meg-calc  
were often problematic to work with due to platform and library  
issues. The single-shell volume conduction model that is avaialble in  
Fieldtrip is currently the preferred volume model.

Looking at the code, there is indeed a bug since cfg.gradfile is not  
defined. If you want to continue along the path of meg-pd and meg- 
calc, you could hardcode the filename and see how far you get. But I'd  
suspect that you don't have the required (commercial) mex files from  
meg-calc anyway.

best regards

On 20 May 2011, at 14:00, Elena Orekhova wrote:

> Hi,
> I try to read volume from the Neuromag .fif file using
> vol = ft_read_vol(NEUROMAG_FIF_FILE_NAME, 'fileformat',  
> 'neuromag_fif')
> I get the error:
> ***********************
> ??? Undefined variable "cfg" or class "cfg.gradfile".
> Error in ==> ft_read_vol at 77
>     fprintf('using Neuromag gradiometer definition from %s\n',  
> cfg.gradfile);
> Any advice?
> Elena
> Elena V Orekhova, Ph.D.
> Inst. Neuroscience and Physiology
> University of Gothenburg
> S-413 45 Gothenburg, Sweden
> phone: +46 31 342 48 02
> elena at neuro.gu.se
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

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