[Eeglablist] Biosemi 32 channel .loc file request

mahsa shalchy mahsa.shalchy at gmail.com
Tue Oct 3 16:19:37 PDT 2017

Dear Tarik and experts,

The thing is my locations seem to work fine just before saving them as
*.ced file. Also, as I try to save them as other types (loc,...) I'm
getting the following error:

Cell contents reference from a non-cell array object.
Error in inputgui>outstruct (line 257)
    else                  currentobj = allobj{index};
Error in inputgui (line 198)
    instruct = outstruct(allobj); % Getting default values
    in the GUI.
Error in pop_writelocs (line 148)
   res = inputgui(geometry, listui,
   'pophelp(''writelocs'');', ...
Error in pop_chanedit (line 696)
                com = pop_writelocs(chans);
Error using waitfor
Error while evaluating UIControl Callback

I would be grateful if someone could help me with this problem.

Many thanks,

On Tue, Oct 3, 2017 at 1:54 PM, Tarik S Bel-Bahar <tarikbelbahar at gmail.com>

> 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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