[FieldTrip] Error while using ft_sensorrealign

Eelke Spaak eelke.spaak at donders.ru.nl
Mon Jul 7 11:49:15 CEST 2014


Hi Federico,

No idea whether this matters (haven't tested it), but perhaps the error is
due to sens.fid.label being a column cell array (3x1) and cfg.target.label
being a row (1x3)?

Best,
Eelke
Op 7 jul. 2014 11:38 schreef <f.chella at unich.it>:

> Hi everyone,
>
> I am getting an error when I use ft_sensorrealign to align my MEG sensor
> (i.e., ITAB MEG sensor) with the subject mri using fiducials.
>
> Below is the code I am using.
> I first specified the fiducial location in the sensor space in the field
> sens.fid:
>  sens.fid.pnt(1,:) = [0   101.5    0] ;
>  sens.fid.pnt(2,:) = [-69.9    -0.6    0.8];
>  sens.fid.pnt(3,:) = [69.9     0.6   -0.8];
>  sens.fid.label{1} = 'nasion';
>  sens.fid.label{2} = 'left';
>  sens.fid.label{3} = 'right';
>
> and then I called ft_sensorrealign:
>  cfg = [];
>  cfg.method   = 'fiducial';
>  cfg.fiducial = {'nasion', 'left', 'right'};
>  cfg.target.pnt(1,:) = [-0.5    86.5   -15.5];
>  cfg.target.pnt(2,:) = [-73.5   -7.5  -43.5];
>  cfg.target.pnt(3,:) = [69.5  -16.5  -44.5];
>  cfg.target.label    = {'nasion', 'left', 'right'};
>  sens_realigned = ft_sensorrealign(cfg,sens);
>
> Now, I get the following error:
>
>  ??? Subscripted assignment between dissimilar structures.
>  Error in ==> ft_sensorrealign at 235
>      tmp(i) = ft_convert_units(template(i), elec.unit); % ensure that the
> units are consistent with the electrodes
>
> Does anyone know why this would be occurring and how to fix it?
> Thanks in advance for the help.
>
>
> Federico Chella, Ph.D.
> Dept. of Neuroscience, Imaging and Clinical Sciences
> ITAB ? Institute for advanced Biomedical Technologies
>  ?G. d'Annunzio? University of Chieti-Pescara, Chieti, Italy
>
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