[Eeglablist] AMICA error on 256 channels EEG

[Hyeonseok Kim]

Dear Ke,

If you run AMICA on Windows, this could happen.

It seems there is a limit to how big data can be handled when you execute system command through MATLAB on Windows.

I suggest 2 solutions.

You can run AMICA on Linux. (I don't use MacOS so I don't know whether this works on Mac. You could test it on Mac and tell us if it works.)

or you can manually execute the 'amica15mkl.exe' after 'input.param' file is generated.

Open the Command Prompt (cmd) and type in [(your amica directory)\amica15mkl.exe + space + (output directory)\input.param]

In my case, the command would be
 'C:\Program Files\MATLAB\R2021b\bin\save\eeglab14_1_2b\plugins\amica1.5\amica15mkl.exe C:\Program Files\MATLAB\R2021b\bin\save\AMICAresult\input.param'

I hope this can help you.

Best regards,
Hyeonseok
________________________________
From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of liao ke via eeglablist <eeglablist at sccn.ucsd.edu>
Sent: Friday, March 11, 2022 8:18 AM
To: eeglablist at sccn.ucsd.edu <eeglablist at sccn.ucsd.edu>
Subject: [Eeglablist] AMICA error on 256 channels EEG

Dear all,

I have a problem in running the AMICA and need your help.

I have used AMICA to process some 128 channel EEG datasets recorded from
EGI system (reduced to 64 channels for calculation)  without any problem.
When I run AMICA on some 256 channel EEG data from the same system, it
always gives me the error message like:
'No gm present, setting num_models to 1
No W present, exiting
Reference to non-existent field 'W'.

Error in runamica15 (line 895)
    weights = mods.W(:,:,1);

Error in pop_runamica (line 338)
    [W,S,mods] = runamica15(g.datfile,arglist{:});

Error while evaluating Menu Callback.'

This happens even I reduce the data into 183 channels. But when I further
reduce the data into 90 channels, the AMICA can run well. I am using AMICA
v1.6.1 with all default parameters from GUI.

Is there any setting wrong with  my AMICA? Is there a channel limitation
with AMICA?

Thanks very much for your help!
Ke
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