[FieldTrip] ft_mvaranalysis

[Tyler Grummett]

JM,


My data has the following format:


data =


       fsample: 500
    sampleinfo: [14x2 double]
         trial: {1x14 cell}
          time: {1x14 cell}
         label: {1x116 cell}
           cfg: [1x1 struct]

I had a look and there are no NaNs or anything. I have tried running using the coherence method for connectivity analysis (hence I didnt need to use mvaranalysis) and it seemed to work fine.

Can you give me any suggestions as to what the problems with my data could be?

Tyler



*************************

Tyler Grummett ( BBSc, BSc(Hons I))
PhD Candidate
Brain Signals Laboratory
Flinders University
Rm 5A301
Ext 66124
________________________________
From: fieldtrip-bounces at science.ru.nl <fieldtrip-bounces at science.ru.nl> on behalf of jan-mathijs schoffelen <jan.schoffelen at donders.ru.nl>
Sent: Tuesday, 3 June 2014 5:06 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] ft_mvaranalysis

This is a low level matlab error and suggests a problem with your data.


On Jun 3, 2014, at 9:32 AM, Tyler Grummett <tyler.grummett at flinders.edu.au<mailto:tyler.grummett at flinders.edu.au>> wrote:

Using the same code it generates the error:

Error using chol
Matrix must be positive definite.

Error in armorf (line 40)
ap(:,:,1) = inv((chol(ap(:,:,1)/Nr*(Nl-1)))');

Error in ft_mvaranalysis (line 395)
            [ar, tmpnoisecov] = armorf(dat, numel(rpt{rlop}), size(tmpdata.trial{1},2),
            cfg.order);



*************************

Tyler Grummett ( BBSc, BSc(Hons I))
PhD Candidate
Brain Signals Laboratory
Flinders University
Rm 5A301
Ext 66124
________________________________
From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> <fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl>> on behalf of jan-mathijs schoffelen <jan.schoffelen at donders.ru.nl<mailto:jan.schoffelen at donders.ru.nl>>
Sent: Tuesday, 3 June 2014 4:49 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] ft_mvaranalysis

Hi Tyler,

Try using ft_hastoolbox('bsmart',1) and then in the cfg for ft_mvaranalysis cfg.toolbox = 'bsmart'

Best,
Jan-Mathijs

On Jun 3, 2014, at 3:39 AM, Tyler Grummett <tyler.grummett at flinders.edu.au<mailto:tyler.grummett at flinders.edu.au>> wrote:

Hello fieldtrippers,

Im having problems with ft_mvaranalysis at line 390: [ar, rc, pe] = mvar(dat', cfg.order, cfg.mvarmethod);

The error message is:

Undefined function 'mvar' for input arguments of type 'double'.

?Ive tried looking for the function, but I cant find it. Is it likely that it is hidden or absent?

I swear this has worked before on old data, and I didnt update the toolbox between trying it
with the old data and with the new data. I have now updated the fieldtrip toolbox and I have
tried running the code again, but no luck.

Tyler

*************************

Tyler Grummett ( BBSc, BSc(Hons I))
PhD Candidate
Brain Signals Laboratory
Flinders University
Rm 5A301
Ext 66124
_______________________________________________
fieldtrip mailing list
fieldtrip at donders.ru.nl<mailto:fieldtrip at donders.ru.nl>
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

Jan-Mathijs Schoffelen, MD PhD

Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl<mailto:J.Schoffelen at donders.ru.nl>
Telephone: +31-24-3614793

http://www.hettaligebrein.nl<http://www.hettaligebrein.nl/>

_______________________________________________
fieldtrip mailing list
fieldtrip at donders.ru.nl<mailto:fieldtrip at donders.ru.nl>
http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

Jan-Mathijs Schoffelen, MD PhD

Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl<mailto:J.Schoffelen at donders.ru.nl>
Telephone: +31-24-3614793

http://www.hettaligebrein.nl

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