[FieldTrip] Brain-shift compensation Error

[Ignasi Sols]

Many thanks, Arjen. I could solve the problem following your suggestion.
It was an issue with the format of the channel information, that was not
recognized by* ft_channelselection.*

Best,
Ignasi

On Wed, Oct 31, 2018 at 2:26 AM Arjen Stolk <a.stolk8 at gmail.com> wrote:

> Hi Ignasi,
>
> One can only guess based on that error msg alone. You might want to put a
> debug marker at line 156, check whether coord0 is truly empty, and then try
> to trace back to what's causing it to be empty (e.g., an empty elecpos
> field in your elec structure?).
>
> Arjen
>
> On Tue, Oct 30, 2018 at 12:04 PM Ignasi Sols <ignasi.sols at nyu.edu> wrote:
>
>> Dear all,
>> I'm following the method developed by Stolk et al (2018) to localize the
>> electrodes of ECoG data.
>> I'm getting this error on step 23 (Project the electrode grids to the
>> surface hull of the implanted hemisphere) and I can't solve it. Could
>> anyone help me with this?
>>
>> Thanks,
>> Ignasi
>>
>>
>> *using electrodes specified in the configuration*
>> *using warp algorithm described in Dykstra et al. 2012 Neuroimage PMID:
>> 22155045*
>> *creating electrode pairs based on electrode positions*
>> *Error using fmincon (line 241)*
>> *You must provide a non-empty starting*
>> *point.*
>> *Error in warp_dykstra2012 (line 156)*
>> *coord_snapped = fmincon(efun, coord0,*
>> *[], [], [], [], [], [], cfun,*
>> *options);*
>> *Error in ft_electroderealign (line*
>> *406)*
>> *    norm.elecpos =*
>>     warp_dykstra2012(cfg, elec,
>>     headshape);
>>
>> --
>> Ignasi Sols
>> Postdoctoral Fellow
>> Department of Psychology
>> New York University
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-- 
Ignasi Sols
Postdoctoral Fellow
Department of Psychology
New York University
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