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Hi Steve,
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<div class="">I think the easiest way to get started for you would be to consult the <a href="https://www.fieldtriptoolbox.org/tutorial/layout/" class="">layout</a> tutorial. At the top it mentions a box which shows what a ‘layout’ variable more or less should
look like after reading it in with ft_prepare_layout. In other words, if you manage to convert the x,y,z positions into a nice 2D-projected x,y positions, you’re almost there.</div>
<div class="">Alternatively, you might need to use ft_prepare_layout to make this 2D projection for you. In that case you probably need to consult the section ‘making a layout from MEG sensors’ and replace the MEG sensor array for your EEG sensor array. This
needs to be defined according to <a href="https://www.fieldtriptoolbox.org/reference/ft_datatype_sens/" class="">https://www.fieldtriptoolbox.org/reference/ft_datatype_sens/</a></div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 5 Nov 2020, at 04:11, Stephen Politzer-Ahles <<a href="mailto:politzerahless@gmail.com" class="">politzerahless@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Hello,
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<div class="">I have electrode channel locations (in x,y,z coordinates) in a file format that I think is not supported by ft_read_sens. I would like to use ft_prepare_layout to project these locations into a 2d layout (for plotting and for cluster-based permutation
tests). I see from <a href="https://www.fieldtriptoolbox.org/tutorial/layout/" class="">https://www.fieldtriptoolbox.org/tutorial/layout/</a> that it's possible to do, but I can't figure out exactly how (it just says "you can use ft_prepare_layout", but not
exactly how; I've tried the following two ways but I get a "no layout detected" error:</div>
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<div class="">cfg = [];</div>
<div class="">cfg.elec = <the filename for my channel locations>;</div>
<div class="">lay = ft_prepare_layout(cfg);</div>
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<div class="">cfg = [];</div>
<div class="">cfg.elec = <a 69x3 matrix of my xyz coordinates>;</div>
<div class="">lay = ft_prepare_layout(cfg);</div>
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<div class="">Is there an example online somewhere of how to use ft_prepare_layout with just a set of xyz coordinates rather than loading a filename or template?</div>
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<div class="">Thanks,</div>
<div class="">Steve</div>
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Stephen Politzer-Ahles<br class="">
The Hong Kong Polytechnic University<br class="">
Department of Chinese and Bilingual Studies<br class="">
<a href="http://www.polyu.edu.hk/cbs/sjpolit/" target="_blank" class="">http://www.polyu.edu.hk/cbs/sjpolit/</a></span></div>
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