[Eeglablist] Query

[Arnaud Delorme]

Dear Hamad,

> 1) My question is that in weight matrix (after running ICA) what are the rows and what are the column values.

The rows are components. The columns are electrodes.

However for the inverse weight matrix, the rows are components and the columns are electrodes.

> 2) I went on your website and I read  ''S=WX'', and X is the EEG data etc. in terms of S,W,X what is the relation of those three matrices we obtain after RUN ICA. Can we say W= weight matrix?

Yes, W is the weight matrix. Alwought in general, W = weight * sphere. Sphering is a just preprocessing before ICA. It should not have been separated from the weight matrix (but it has).
Hope this clarifies things a bit,

Arno

>  S=ICAsphere,  ICAwinv=W inverse.
> so out of these matrices is anyone is X? or we will have to compute.
> I am basically confused in THE weight matrix after RUN ICA we obtain and have no labels on rows and columns. So i want to ask what are these values (rows) from left to right electrodes or components? or column value are electrodes? or both not?
> 
> 
> Thank you for your time.
> 
> Regards,
> Hamad Javaid.
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