[Eeglablist] Plotting Spatial PCA Factors

[Arnaud Delorme]

Dear Justine,

yes, the GSN-HydroCel-129.sfp is the standard EGI file (128 channel + Cz reference). 
Simply delete the channel you have removed in this file and you will be able to use it directly in topoplot

topoplot(x,'GSN-HydroCel-129_reduced.sfp');

Arno

On Oct 11, 2011, at 8:00 AM, VANDYKE, JUSTINE wrote:

> I am trying to plot a PCA derived spatial factor in Matlab. I have PCA toolkit, EEGlab, and Fieldtrip folders downloaded and included in the path.
>  
> In the past, I have worked with a 64 Channel Neuroscan cap, and I have used the following commands (in Matlab):
>  
> x = FacPat(:,1);
> topoplot(x,'Neuro64.loc');
>  
> This time, I used a 128-channel EGI HydroCel net; however, for the PCA, I excluded channels 127 and 128. That leaves 126 recording electrodes and 1 reference electrode (Cz).
>  
> I saw in EEGLab that there is a GSN-HydroCel-129.sfp file under ‘sample locs’.
>  
> I was wondering if I can adapt this/use this somehow to plot my spatial factors. If so, I was wondering if someone could help me with this. I tried simply deleting the channels I am not using and saving the file (as a .loc), but this does not work (using the topoplot function).
>  
> Thanks!
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