[Homer-users] Problem in using PCA Filter

[David Boas]

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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