[Eeglablist] a question about csp code ,please help me

[Bian Wu]

maybe you should add pre-whitening stage before it. Also, the data needs
processing before applying CSP.
There is code publicly available, you can refer to it.

On Fri, Sep 16, 2011 at 2:40 AM, ahmad hasanpour <a.ahp89 at gmail.com> wrote:

> please help me my friends,i see  csp code in bci lab ,let me describe for
> you understand i get it; first create k fold with 10,and then take set of
> trials different for obtain good spatial filter?(i cant understand this
> section please describe it)
>
> after u obtain good spatial filter u  apply it on test trails.
>
> i do this steps on datasetIIIa but i cant get good result(2 classes).
>
> cov1=cov(signals(1:400,:));        %Class 1
> cov2=cov(signals(803:1203,:));    %Class2
>
> [W D]=eig(cov1,cov1+cov2);
>
> filter=W(:,[1:3 56:59]);                % M first and end W
>
> sig1=signals(1:400,:)*filter;
>
> sig2=signals(803:1203,:)*filter;
>  log(var(sig1))
>  -4.2778   -3.6758   -2.9707   -0.1514   -0.1446   -0.1144   -0.0163
>
> log(var(sig2))
>   -0.0140   -0.0257   -0.0526   -1.9627   -2.0050   -2.2249   -4.1225
>
> sig3=signals(402:802,:)*filter;   *%Class1  for Test*
> log(var(sig3))
>  0.0388   -0.9152    0.1855   -0.2021   -0.0560   -0.8266   -1.8903
>
> i dont have good result;why?
>
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