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Hi Victor,
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<div class="">You don’t mention which fieldtrip version you are currently using, but ft_sensorrealign has been moved to compat/obsolete about a year ago. This means that this particular function is not actively maintained and supported anymore. At the moment,
I don’t remember the reason for this, but it would mean that there is functionality in the main fieldtrip functions that got rid of the raison d’etre of ft_sensorrealign. </div>
<div class="">As is mentioned in the README of the compat/obsolete directory, you should move ft_sensorrealign up a few directories. The reason for this is that the function might rely on low-level functions that are located in fieldtrip/private, which are
only visible from function that are located in the directory that contains the private folder. ‘fixpos’ might be one of them.</div>
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<div class="">Best wishes,</div>
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<div class="">Jan-Mathijs</div>
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J.M.Schoffelen, MD PhD<br class="">
Senior Researcher, VIDI-fellow - PI, language in interaction<br class="">
Telephone: +31-24-3614793</div>
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Physical location: room 00.028</div>
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Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands<br class="">
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<div class="">On 30 Oct 2018, at 10:43, Victor RG <<a href="mailto:victor.rg.gib@gmail.com" class="">victor.rg.gib@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">HI Fieldtrip experts!
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<div class="">I'm trying to align a headmodel (the one from example "Subject1") with my MEG sensors (Yokogawa system).</div>
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<div class="">I'm trying to do that interactively, in order to construct a Leadfied matrix as accurate as possible. To do that, I am testing this code:</div>
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<div class=""><i class="">cfg = [];</i></div>
<div class=""><i class="">cfg.method = 'interactive';</i></div>
<div class=""><i class="">cfg.headshape = vol.bnd(1);</i></div>
<div class=""><i class="">cfg.senstype = 'meggrad';</i></div>
<div class=""><i class="">grad_aligned = ft_sensorrealign(cfg, grad); % Im using ft_sensorrealign cause I think is the MEG version of ft_electroderealign</i></div>
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<div class="">The variables employed consist of:</div>
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<div class=""><b class="">>> grad = </b></div>
<div class="">struct with fields:</div>
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<li class="">balance: [1×1 struct]<br class="">
</li><li class="">chanori: [160×3 double]<br class="">
</li><li class="">chanpos: [160×3 double]<br class="">
</li><li class="">chantype: {160×1 cell}<br class="">
</li><li class="">chanunit: {160×1 cell}<br class="">
</li><li class="">coilori: [320×3 double]<br class="">
</li><li class="">coilpos: [320×3 double]<br class="">
</li><li class="">label: {160×1 cell}<br class="">
</li><li class="">tra: [160×320 double]<br class="">
</li><li class="">type: 'yokogawa160'<br class="">
</li><li class="">unit: 'cm'<br class="">
</li><li class="">fid: [1×1 struct]<br class="">
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<div class=""><b class="">>> vol.bnd(1) =</b></div>
<div class="">struct with fields:</div>
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<li class="">pos: [1000×3 double]<br class="">
</li><li class="">tri: [1996×3 double]<br class="">
</li><li class="">coordsys: 'ctf'<br class="">
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<div class="">I have looked at the tutorial for EEG sensors realignment, and I have copied the procedure, since there is not a specific tutorial for MEG sensors. I thought it would be the same, but when executing it I obtain the following errors:</div>
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<div class=""><i class=""><b class="">>> </b>Undefined function 'fixpos' for input arguments of type 'struct'.</i></div>
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<div class=""><i class="">Error in ft_sensorrealign (line 255)</i></div>
<div class=""><i class="">headshape = fixpos(cfg.headshape);</i></div>
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<div class=""><i class="">Error in generating_leadfield (line 63)</i></div>
<div class=""><i class="">grad_aligned = ft_sensorrealign(cfg, grad);</i></div>
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<div class="">Does anybody know how to do that, or how to do an interactive realignment with MEG sensors?</div>
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<div class="">Thanks in advance.</div>
<div class="">Víctor.</div>
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<div class="">Víctor Rodríguez González</div>
<div class="">Grupo de Ingeniería Biomédica, ETSIT.</div>
<div class="">Universidad de Valladolid, España.</div>
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