[Eeglablist] PCA inquiry

[Joseph Dien]

Just to clarify, George is using a script someone in his lab (apparently 
no longer available) made to use a combination of EEGlab and EP Toolkit 
functions to perform the two-step PCA procedure.  The latter part is 
irrelevant.  He ran into an error with the EEGlab function 
pop_chanedit.  It wasn't recognizing his .xyzloc files, whatever they are.

Cheers!

Joe

On 7/29/26 19:25, Makoto Miyakoshi via eeglablist wrote:
> Hi George,
>
> Is that temporospatial PCA some kind of EEGLAB plugin or external
> application connected to it? If you are still looking for a solution,
> please point me to the tool you want to use.
>
> Makoto
>
> On Tue, Jul 14, 2026 at 5:10 PM Ghorayeb, George Ryan via eeglablist <
> eeglablist at sccn.ucsd.edu> wrote:
>
>> Greetings,
>>
>> I am writing to request your assistance regarding an issue I have
>> encountered while attempting to perform a temporospatial PCA using EEGLab.
>> Specifically, when trying to carry out the PCA on our dataset, I am unable
>> to proceed beyond the step requiring the upload of a .xyzloc file. Each
>> time I attempt to upload the file, I receive the following error message:
>>
>> Error using readlocs>load_file_or_array
>> readlocs(): cannot find the named file or variable, check syntax
>>
>> Error in readlocs (line 529)
>>             array = load_file_or_array( filename, g.skiplines);
>>
>> Error in pop_chanedit (line 760)
>>                          [chans] = readlocs(tmpargs{:});
>>
>> Error in Import_text_veps (line 36)
>> EEG = pop_chanedit(EEG,'load',{xyzLoc, 'filetype', 'xyz'},'delete',d);
>>
>> Error in PCAMakeStudy (line 82)
>>      Import_text_veps(text_paths{j},[textfileworkspace
>> '\'],setfilepathname,...
>>
>>
>> I have consulted several online resources and tried multiple
>> troubleshooting approaches, but I have not been able to resolve the issue.
>>
>> I would be very grateful if you could advise me on the appropriate steps
>> to address this problem or suggest any potential causes that I should
>> investigate.
>>
>> Thank you very much for your time and assistance. I greatly appreciate
>> your help.
>>
>>
>> Kind regards,
>>
>> George
>>
>>
>>
>> _____________________
>>
>> George Ryan Ghorayeb
>>
>> He/him/his
>>
>> Research Assistant II, Division of Cognitive and Behavioral Neurology
>>
>> Center for Brain/Mind Medicine
>>
>>
>>
>> Brigham and Women’s Hospital
>>
>> 60 Fenwood Road, 9016D, Boston, MA 02115
>>
>> T 6177328825, F 8573075461
>>
>> brighamandwomens.org
>>
>>
>>
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-- 
--------------------------------------------------------------------------------

Joseph Dien, PhD
Senior Research Scientist
Department of Human Development and Quantitative Methodology
University of Maryland, College Park
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