[FieldTrip] 642 nodes for source model based on cortical sheet

[andrea brovelli]

Thanks, it works by simply putting cfg.spheremesh = xxxx in the cfg of  
ft_prepare_leadfield.

But was there as special reason why this was set to 642 ?

thanks

Andrea


----- Message de eelke.spaak at donders.ru.nl ---------
     Date : Wed, 5 Dec 2012 10:52:09 +0100
      De : Eelke Spaak <eelke.spaak at donders.ru.nl>
Répondre à : FieldTrip discussion list <fieldtrip at science.ru.nl>
  Objet : Re: [FieldTrip] 642 nodes for source model based on cortical sheet
       À : FieldTrip discussion list <fieldtrip at science.ru.nl>


> Dear Andrea,
>
> To be honest, I have never used or worked on ft_prepare_sourcemodel,
> but I do know that the line you quote is a call to ft_getopt in which
> the last value is only the default. So, if cfg has a field called
> 'spheremesh', then that value will be used, rather than the default.
>
> Put in other words:
>
> cfg = [];
> cfg.spheremesh = 12;
> result = ft_getopt(cfg, 'spheremesh', 642)
>
> then result should be 12, and not 642.
>
> Have you tried specifying cfg.spheremesh = some value? If that does
> not work, the value is being changed somewhere else, not in the line
> you quote (which might be a bug, I don't know enough about
> ft_prepare_sourcemodel to make that judgement).
>
> Best,
> Eelke
>
> On 5 December 2012 10:32, andrea brovelli  
> <andrea.brovelli at univ-amu.fr> wrote:
>>
>> Dear all,
>>
>> I am constructing a source model based on cortical sheet and I get always
>> 642 nodes.
>>
>> I tried to track down this magic number and I have found that at lines 209
>> and 229 of ft_prepare_sourcemodel.m you fix it to:
>>
>>   cfg.spheremesh  = ft_getopt(cfg, 'spheremesh', 642); % FIXME move
>> spheremesh to cfg.grid
>>
>>
>> What was the rationale behind this ?
>>
>> Did you modify this in more recent versions of Fieldtrip or how could we
>> have it in the cfg in the future ?
>>
>> Thanks a lot
>>
>> bye
>>
>> Andrea
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