Re: [Erppcatoolkit-support] different average conditions per participant

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*Dear Joe,*

*it worked perfectly, thank you very much. Unfurtunaltely I am having a new
problem: I run the first step temporal PCA and everything goes fine, when I
then try to run the spatial pca on the temporal PCA factors I get this
error:*

??? Reference to non-existent field 'recTime'.

Error in ==> ep_doPCA at 879
    FactorResults.recTime=theData.recTime;

Error in ==> ep_doPCAst at 339
    [stFactorResults] = ep_doPCA('asis', ROTATION, ROTOPT, MAT_TYPE,
NUM_FAC, theData, LOADING);

Error in ==> ep>pickPCAdata at 5593
        FactorResults = ep_doPCAst(theData.pca, 'UNRT', EPmain.pca.rotopt,
PCArel, 1, PCAloading,PCAmode); %scree test only
        needs unrotated solution

??? Error while evaluating uicontrol Callback

*If I put a comment before this part of the ep_doPCA script:*

 %FactorResults.recTime=theData.recTime;

*then the the scree test works, and the spatial PCA (Infomax rotation)
actually starts but at the very end I get this error:*

Done with reconstructing PCA waveforms...
??? Index exceeds matrix dimensions.

Error in ==> ep_addToEPworkCache at 123

minFac=min(min(min(EPdata.data(EEGchans,:,theCell,theSub,theFactor,:))));

Error in ==> ep_saveEPdataset at 75
newDataset=ep_addToEPworkCache(EPdata);

Error in ==> ep>pickPCAdata at 5730

EPdataset=ep_saveEPdataset(EPdataset,PCAoutput,length(EPdataset.dataset)+1,'no');

??? Error while evaluating uicontrol Callback

*The same thing happens if i try to run the spatial PCA on the average
data.*

*I am using Matlab 2007b but I have also try Matlab 2011*
*                   Eeglab 8_3*
*                   Fieldtrip lite last version available*

*I thank you in advance for your help and apologize if the question is too
basic, I've tried to solve the problem by reading the tutorial but I
couldn't figure it out.*

*Best wishes,*

*Serena*

On 15 December 2013 07:51, Joseph Dien <jd...@ma...> wrote:

> I’m going to assume that you are using a file format like Neuroscan .AVG
> where each condition of each subject is a separate file.  If so, use the
> Single File option of the Read function to import them (see documentation).
>  It’ll form a single file in which each subject and each condition is
> separate but are all held in a single file for convenience sake.
>
> Cheers!
>
> Joe
>
>
> On Dec 14, 2013, at 4:56 AM, Maria Serena Panasiti <
> m.s...@gm...> wrote:
>
> Dear All,
>
> I have just downloaded the toolkit to perform PCA on my averaged data. I
> am struggling to understand how I can keep my experimental conditions
> separeted when I read my data on the toolkit.
>
> I have two experimental conditions for each subject. I glued all of the
> averages together in the edit window (append function); I gave the same
> subject name to the two experimental conditions averages and assigned them
> a weight of :
>
> weight   name
> 1            sub001   (This would be: AVg condtion1 subject1)
> 1            sub001   (This would be: AVg condtion2 subject1)
> 1            sub002    (This would be: AVg condtion1 subject2)
> 1            sub002   (This would be: AVg condtion2 subject2)
> 1            sub003   (This would be: AVg condtion1 subject3)
> 1            sub003   (This would be: AVg condtion2 subject3)
>
>
>
> When I run the PCA, the toolkit treats each raw as a single participant
> (in the command window it would count up to six in this case)
> So I was wondering if this was the right way to feed the program with
> different averages per conditions.
>
> As I understood PCA I should need to keep conditions separated but please
> tell me if I am wrong.
>
> Any help would be very much appreciated.
>
> Best wishes,
>
> Serena
>
>
>
> --
> Maria Serena Panasiti, Ph.D
>
> Cognitive Social and Affective Neuroscience Lab
> Department of Psychology.
> University of Rome "La Sapienza".
> Via dei Marsi 78 - 00185 - Roma.
> Phone: (+39) 06-49917635. Fax: (+39) 06-49917635
>
> School of Psychology & Clinical Language Sciences
> University of Reading
> Reading, United Kingdom
>
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>
> --------------------------------------------------------------------------------
>
> Joseph Dien,
> Senior Research Scientist
> Maryland Neuroimaging Center
> University of Maryland
>
> E-mail: jd...@ma...
> Phone: 202-297-8117
> http://joedien.com
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>

-- 
Maria Serena Panasiti, Ph.D

Cognitive Social and Affective Neuroscience Lab
Department of Psychology.
University of Rome "La Sapienza".
Via dei Marsi 78 - 00185 - Roma.
Phone: (+39) 06-49917635. Fax: (+39) 06-49917635

School of Psychology & Clinical Language Sciences
University of Reading
Reading, United Kingdom