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<div class="moz-cite-prefix">On 14/01/2013 22:14, Emma Holmes wrote:<br>
</div>
<blockquote
cite="mid:CAOXK68iA7UYQob9yQ11XkcUSQr2Rxf5+4BB_GJin+1s3V_i8Bg@mail.gmail.com"
type="cite">
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<p class="">Dear FieldTrip users,</p>
<p class=""> </p>
<p class="">I would like to define the positions of the EEG
electrodes
myself.</p>
<p class="">I have a structure containing the x,y,z co-ordinates
and
channel names for 66 channels. However, I am having trouble
converting this to
a FieldTrip structure.</p>
<p class=""> </p>
<p class="" style="text-autospace:none">I’m trying to use the
ft_prepare_layout() function.</p>
<p class="" style="text-autospace:none">Can anyone tell me what
format
the input structure should be in? i.e. what fields it should
contain.</p>
<p class="" style="text-autospace:none">Here, I’m referring to
the part
of the documentation ‘cfg.elec: structure with electrode
positions’, but
can’t seem to find any explanation of what the layout of this
structure should
be.</p>
<p class="" style="text-autospace:none"> </p>
<p class="" style="text-autospace:none">Many thanks,</p>
<p class="" style="text-autospace:none">Emma</p>
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</blockquote>
Hello<br>
<br>
First create a structure called elec with two fields in int<br>
elec.pnt -> N x 3 matrix -> electrode positions<br>
elec.label - > 1 x N cell -> electrode label<br>
<br>
Then you can write the following script<br>
<br>
cfg = []<br>
cfg.elec = elec;<br>
lay = ft_prepare_layout(cfg, data);<br>
<br>
where data is as provided by ft_preprocessing etc<br>
<br>
Hope this works.<br>
<br>
<pre class="moz-signature" cols="72">--
With Best Regards,
Narayan P Subramaniyam, M.Sc.
Researcher/PhD student
Department of Electronics and Communications Engineering
Tampere University of Technology
Finn-Medi 1, 4th Floor, Room 203
Biokatu 6, FI-33520 Tampere, Finland
Tel: +358 (0)40 198 1951
E-mail: <a class="moz-txt-link-abbreviated" href="mailto:narayan.ps@tut.fi">narayan.ps@tut.fi</a>
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