[Eeglablist] Plot and Interpolate existing data

[Arnaud Delorme]

Dear Ibtissem,

You can import you channel location in the EEGLAB channel editor (which you can use even with no dataset by type pop_chanedit([]); on the Matlab command line). The graphic interface will allow you to plot electrodes in 3-D. If you already have an EEGLAB dataset, you may use the direct call  pop_chanedit(EEG.chanlocs, 'plot3d', []);

To plot data (not electrodes) interpolated in 3-D using Perrin's method below, you have use the EEGLAB headplot function.
The function eeg_interp will also perform spherical interpolation using Perrin's method.

Best,

Arno

On 26 Apr 2013, at 11:25, Jeff Eriksen wrote:

> You should use something like spherical harmonics for good interpolation. Search for Perrin, Pernier, Bertrand, & Echallier, 1989
> -Jeff Eriksen
> 
> From: "Ibtissem Khouaja b.Fraj" <ibtissem.khouaja at live.fr>
> Date: Thursday, April 25, 2013 2:26 AM
> To: "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
> Subject: [Eeglablist] Plot and Interpolate existing data
> 
> Dear list,
> 
> I'm looking for an algorithm that takes as input the spherical coordinates of the electrodes then draw in a spherical plane.
> 
> For exemple: 
> adress1 : Fp1 =[-0.1415 0.4662 2.1]
>                 Fp2 = [0.1615 0.4662 2.1]
>                 F7 = [-0.3866 0.2881 2.1]
> ...........
>  
> The aim is to interpolate  electrodes address to create new addresses and pred the amplitude of new addresses.
> 
> Many thanks.
> 
> 
> 
> -----------------------------------------------------------------------------
> Ibtissem KHOUAJA
> Computer lab Gaspard Monge (http://igm.univ-mlv.fr/LIGM/)
> Paris-Est University, France.
> -----------------------------------------------------------------------------
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