[FieldTrip] denoise_pca error

[Ashley Greene]

Hi Jan,

I've done electrophysiological research but am a beginner with MEG, and I'm
using the data from the Centre for Cognitive Neuroimaging provided from and
used in the fieldtrip tutorial website.

Ashley

On Tue, Sep 23, 2014 at 2:31 PM, jan-mathijs schoffelen <
jan.schoffelen at donders.ru.nl> wrote:

> Hi Ashley,
> Since your e-mail did not contain any background information with respect
> to the acquisition system you are using, I cannot be really to-the-point in
> my answer.
> Ft_denoise_pca has been designed to operate on
> 1) MEG data, that
> 2) has been acquired on a system that has external reference channels.
> I don’t know what reference channel you specified, but it seems you
> didn’t, and the function probably indeed defaulted to a value that caused
> the selection to be empty or so. But again, without additional info it’s
> hard to tell.
> Best and good luck,
> Jan-Mathijs
>
>
>
> On Sep 22, 2014, at 3:27 PM, Ashley Greene <agreene24 at gmail.com> wrote:
>
> Hello all,
>
> I hope someone will be able to help with this. I'm trying to run the
> denoise_pca function on data after preprocessing, but I continue to get the
> following error:
>
> Error using  ./
> Matrix dimensions must agree.
>
> Error in ft_denoise_pca (line 193)
>     s1   = s./max(s(:));
>
> Could it be due to the use of the default for refchannel? Forgive me for
> asking such simple questions, but how do I go about choosing the reference
> channel? Do I just choose the cleanest channel from that particular set of
> preprocessed data?
>
> Thanks in advance,
>
> Ashley
> _______________________________________________
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>
>
> 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
> Telephone: +31-24-3614793
>
> http://www.hettaligebrein.nl
>
>
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