[Eeglablist] how to interpolate bad electrodes

[Bradley Voytek]

Sebastian:

In order for the interpolation to work correctly, you need to have the
electrode positions. My guess is that you don't have that. You can
load default 10-20 electrode locations through the eeglab GUI by
selecting edit > channel locations > look up locs.

::brad

On Fri, Sep 12, 2008 at 8:28 AM, Sebastian Korb
<Sebastian.Korb at pse.unige.ch> wrote:
> Dear eeglabbers,
>
> I would like to interpolate noisy electrodes (they are thus not missing in
> the chanlocs file) using the eeg_interp function.
> I thought that the best thing to do would be to first try with the tutorial
> dataset (eeglab_data.set).
> However, even then I am unable to use the function correctly and constantly
> get an error message.
>
> EEG = eeg_interp(EEG, 14);     %that 's what I've entered in matlab, to
> interpolate the electrode n.14 (Cz)
>
>
> %and here comes what I got:
>
> Points (/30720):??? Error using ==> griddata at 50
>
> X and Y must be same length as Z or the lengths
>
> of X and Y must match the size of Z.
>
> Error in ==> eeg_interp at 185
>
>           [Xi,Yi,badchansdata(:,t)] = griddata(ygood, xgood ,
> tmpdata(:,t)',...
>
>
> As I am new to eeglab, I tried replacing the 'EEG' in the brackets by the
> index of the dataset (e.g. 1), or even by the name of the dataset
> ('Continuous EEG Data epochs').
> The result was not better though.
>
> Could anybody please help me to resolve this problem?
> Thank you very much in advance.
> Regards,
>
> Sebastian Korb
>
>
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