Warning message when starting EEGLAB due to ERPLAB var

[arnodelorme]

Description

I get this warning message when starting EEGLAB "Warning: The value of local variables may have been changed to match the globals. Future versions of MATLAB will require that you declare a variable to be global before you use that variable."

This is due to ERPLAB code in the eeg_global function of EEGLAB. How can we remove the warning message (I am maintaining EEGLAB).

if exist('eegplugin_erplab.m')
    global ALLERP; % Javier Lopez-Calderon for ERPLAB
end

Steps to Reproduce

1. Install EEGLAB and ERPLAB
2. Start EEGLAB

Expected behavior:

No Warning

Actual behavior:

Warning is displayed

Versions

OS version	OSX
Matlab version	2018a
EEGLAB version	2019_0
ERPLAB version	v7.0.0

[andrewxstewart]

Hi Arno,

Thanks for reporting this.

Is that snippet from eeglab.m?

Strangely, I'm on (the latest?) EEGLAB v14.1.2 and ERPLAB v7 and I don't get that error. Also Matlab R2018a.

[andrewxstewart]

Ah - I see. 2019.0 is the latest development version of EEGLAB you are working on.

I do now see this error. I think it only shows once, and then Matlab needs to be restarted to see it again.

This error is produced when eeglab.m calls eeg_global.m.

Error only manifests:

• on first run of eeglab after restarting Matlab
• at line 1100 of eeglab, on the eeglab('redraw') call

I think this is the first time that eeglab is called again after eegplugin_erplab.m is run.

So I think I can fix this by ensuring that the first use of ALLERP in eegplugin_erplab.m is of the global ALLERP.

Testing this looks like it stops that Matlab warning message!

Could you check that the ERPLAB in this commit fixes this for you? https://github.com/lucklab/erplab/archive/db4a9ca6fd74e070d1f97c5e286e5bb2b970c94b.zip

Cheers, Andrew

[arnodelorme]

Yes no more warning.