[Eeglablist] Query

[Arnaud Delorme]

Hi Hamad,

I meant: "However for the inverse weight matrix, the rows are electrodes and the columns are components." Sorry for the confusion,

Arno

> On Oct 7, 2018, at 2:43 PM, Arnaud Delorme <arno at ucsd.edu> wrote:
> 
> 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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