[Eeglablist] PCA inquiry

[Makoto Miyakoshi]

Hi Joe,

Yes, that sounds like the case. The problem happens in importing
electrode locations. Thanks for your clarification.

Makoto

On Thu, Jul 30, 2026 at 5:04 PM Joseph Dien via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> 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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