[Homer-users] Problem in using PCA Filter

[Rishabh Gupta]

Hi David,

First of all thanks a lot for answering my doubt.

I have tried varying nSV many times ranging from 1,2, etc. and also values
less than 1, but it always shows this error. I have 45 channels in total. I
checked the code where you calculate the SVD (in the enPCA filter script),
there the SVD function takes in 'c' as the input variable but somehow one
of the columns of 'c' matrix has Inf or -Inf. Can you identify what must be
going wrong?

Thanks

Rishabh

On Sun, Mar 17, 2013 at 1:07 PM, David Boas <dboas at nmr.mgh.harvard.edu>wrote:

>  What is the input that you put in for the nSV for the PCA options?
>
> The input for nSV should be an integer n, where n is typically 1, 2, or 3
> and must be less than or equal to the total number of data channels that
> you have. nSV can also be a number less than 1 in which case the PCA will
> remove just enough components from the data to remove less than n*100 % of
> the variance in the data.
>
> For motion correction, you only need to enter one number for nSV and this
> tells the PCA filter to apply it to all channels at the same time.
>
> From the error that you are reporting, it seems like you have not entered
> a valid number for nSV.
>
>
>
>
> On 3/17/13 1:13 AM, Rishabh Gupta wrote:
>
> Hi Everyone,
>
>  I am using NIRx NIRSScout system for my experiments and I was using
> Homer2 for the analysis of my signals. In my process stream I have the PCA
> Filter for motion correction but every time I run it it gives an error
> saying: " ??? Error using ==> svd    Input to SVD must not contain NaN or
> Inf." Did anyone else encounter the same problem? Could anyone please let
> me know how to troubleshoot this error?
>
>  ERROR MESSAGE:
>
>  ??? Error using ==> svd
>  Input to SVD must not contain NaN or Inf.
>
>  Error in ==> enPCAFilter at 86
>         [V,St,foo] = svd(c);
>
>  Error in ==> EasyNIRS_Process at 88
>         eval( fcall );
>
>  Error in ==> EasyNIRS>runNIRSsignalProcess at 971
> [procResult procInput err] = EasyNIRS_Process(hmr);
>
>  Error in ==> EasyNIRS>popupmenuNIRSsignalProcess_Callback at 1382
>         [procResult err] = runNIRSsignalProcess(iGrp,iSubj,iRun,handles);
>
>  Error in ==> gui_mainfcn at 96
>         feval(varargin{:});
>
>  Error in ==> EasyNIRS at 43
>     gui_mainfcn(gui_State, varargin{:});
>
>  Error in ==>
>
> @(hObject,eventdata)EasyNIRS('popupmenuNIRSsignalProcess_Callback',hObject,eventdata,guidata(hObject))
>
>
>  Thanks a lot.
>
>
>  Rishabh Gupta
>
>
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