[Eeglablist] Index error when reading Neuroscan channel .dat

[Grace Margaret Harvie]

Hi Cedric,

Thanks for your reply!

The data does have channel labels, so I was using a template while getting the hang of pre-processing (although I had to use the 10-5 template in order to get all the locations for all 26 cephalic channels; not all of the labels were present on the 10-20 or 10-10 templates).

Mostly I just want to use the .dat file to double check the accuracy of the template locations (which is probably overkill, but I thought it was worth doing, since I had to use a template with much greater electrode density than the cap which was used).

Thanks,
Grace Harvie
________________________________
From: Cedric Cannard <ccannard at protonmail.com>
Sent: 13 December 2022 09:58
To: Grace Margaret Harvie <ghar8070 at uni.sydney.edu.au>
Cc: eeglablist at sccn.ucsd.edu <eeglablist at sccn.ucsd.edu>
Subject: Re: [Eeglablist] Index error when reading Neuroscan channel .dat

Dear Grace,

I didn't have to use a .dat file when I worked with Neuroscan data in the past, but here is something you can try: When you type {EEG.chanlocs.labels} in the command window, does it return the channel labels? If so, and if you followed the 10-20 template when you recorded your data, you should be able to simply import the default BEM channel locations (Edit > channel locations > Ok > Plot 2D to check visually > Ok).

Hope this helps,

Cedric



------- Original Message -------
On Tuesday, December 6th, 2022 at 1:45 PM, Grace Margaret Harvie via eeglablist <eeglablist at sccn.ucsd.edu> wrote:


> Hi All,
>
> Tried to send this same email yesterday but the filter didn't like it, so I'm sending it again.
>
> I'm trying to read channel locations from the Neuroscan .dat file for a 40 channel Quik-Cap, and I keep getting an index error:
>
>
> Reading file (lines): 10 20 30 40 45
> Index in position 1 exceeds array bounds. Index must not exceed 45.
>
> Error in readneurolocs (line 102)
> locs = locs(tmpind,:);
>
> Error in readlocs (line 413)
> eloc = readneurolocs( filename );
>
> Error in pop_chanedit (line 737)
> [chans] = readlocs(tmpargs{:});
>
> Error while evaluating UIControl Callback.
>
>
> I'm not sure if this is something I'm doing/not doing (I am very new to all this, having only been using EEGLAB for a few weeks) or if I've stumbled across a bug? Regardless, any insight anyone has would be greatly appreciated. I have also attached the channel location file in case it is of any use.
>
> Many thanks,
> Grace Harvie
> PhD Candidate, Faculty of Medicine and Health, University of Sydney
> Research Assistant, Brain Dynamics Centre, The Westmead Insitute for Medical Research
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