[Eeglablist] Biosemi 32 channel .loc file request

[Tarik S Bel-Bahar]

Hello Mahsa,
Nice try, looks like you're almost there.
In the future send questions to eegablist list and if you wish CC me.
Beware of doing things from command line only.
However, you should be able to
1. Use the code line and file you have developed
2. Then save the file (via command line or gui)
3. Then close eeglab, then restart eeglab, then reopen the file form the
GUI.
4. Then see if the locations still seem good by jsut plotting the channel
locations (rather than editing the channel locations).
5. If the saved file is okay, then you might be good to go.

*the issue your're having is about how the coordinates numbers are coded.
You would want to make sure that they are in the proper coordinate system.
Note that in the Edit Channel locations gui, there are multiple buttons to
"transform the coordinates" that you should play with to get a more stable
solution.

*you also want to plot in 3D from the Edit channel locations to see that
the locations are good.

*overall you should not be having this problem, and should have a perfect
file.

*you may want to try to change the filename from *.CED to sfp, and/or let
eeglab decide.

*try to get things working correctly from GUI first before relying on
command line only (though sometimes command line options will save the day).










On Tue, Oct 3, 2017 at 2:17 AM, mahsa shalchy <mahsa.shalchy at gmail.com>
wrote:

> Dear T,
>
> I extracted a text file using Biosemi excel coordination (please find
> attached) and then used it with the following command:
> >> pop_chanedit(readlocs('biosemi_eloc.txt', 'format', { 'labels'
> 'sph_theta_besa' 'sph_phi_besa' }, 'skiplines', 1))
>
> At this point every thing looks fine (please find attached a 2D plot of
> the locations).
>
> Then, I saved the location as *.ced file (please also find attached).
>
> However, as I go to edit>channel location and upload the *.ced file that I
> just created, all the electrodes weirdly fall into a spot near right eye
> (please see the last attachment). Would you please help me with this.
>
> I highly appreciate your help.
>
> Many thanks,
> Mahsa
>
> On Sat, Sep 23, 2017 at 3:40 PM, Tarik S Bel-Bahar <
> tarikbelbahar at gmail.com> wrote:
>
>> Hello Mahsa,
>>
>> If you google "biosemi channel location files", the first link
>> should be Head Caps from Biosemi, and there there is a downloadable
>> positions file for all their caps.
>> From there, you should be able to make a text loc file for their 32
>> channel montage.
>> Just make a text file that is formatted like other location files that
>> are already in the eeglab channel locations folder (sample_locs folder),
>> and you should be good to go.
>> It should have a label, and x y z coordinates, and then eeglab should be
>> able to read it with no problem via the Edit>  Channel locations import
>> function in the eeglab gui.
>> If you have trouble with that, send a copy of the file you made, and one
>> of the eeglab channel locs files, and detail any issues you had.
>>
>>
>>
>> On Wed, Sep 20, 2017 at 11:46 AM, mahsa shalchy <mahsa.shalchy at gmail.com>
>> wrote:
>>
>>> Dear list,
>>>
>>> Could anyone kindly share ".loc" file of 32 channel layout with me? I
>>> failed to extract the file using Biosemi xls coordinates and unfortunately
>>> links that I found on the forum archive are broken.
>>>
>>> Many thanks,
>>> Mahsa
>>>
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>
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