[Eeglablist] Index error when reading Neuroscan channel .dat

[Cedric Cannard]

Yes the BEM 1005 covers more labels. Should be fine. Can you open the .dat file with a text editor and compare the XYZ coordinates (or theta) with what’s in EEG.chanlocs?

Cedric

On Mon, Dec 12, 2022 at 16:15, Grace Margaret Harvie <ghar8070 at uni.sydney.edu.au> wrote:

> 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
>> _______________________________________________
>> Eeglablist page: https://urldefense.com/v3/__https://protect-au.mimecast.com/s/MTxrCK1DvKTqY8gMntM6IZz?domain=sccn.ucsd.edu__;!!Mih3wA!AM47FaXUwln7kpEx9FndeuaqzPrWtwbNOgyV_tf7zpeVz48JYeAunhsBb4AQY7OD5dxq7l_vOKxd7vhtc7tfSsim3A$ 
>> To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu
>> For digest mode, send an email with the subject "set digest mime" to eeglablist-request at sccn.ucsd.edu