[FieldTrip] About preprocessing and define trial

[Beom Jun Min]

Dear Eelke Spaak

Thank you very much.
It works perfect!

Best regards.


2013/5/16 Eelke Spaak <eelke.spaak at donders.ru.nl>

> Dear BeomJun,
>
> What you describe is definitely possible. If you specify:
>
> cfg = [];
> cfg.dataset = 'dataset';
> data = ft_preprocessing(cfg);
>
> you will get one very big 'trial' in the data structure, representing
> just all your data. In the step above, you can also specify filter
> options.
>
> After this step, you can segment your data into trials by using
> ft_redefinetrial (rather than ft_definetrial). However, you still need
> a trl matrix containing the trial definition. The easiest way to
> obtain this is to still call ft_definetrial as you used to do:
>
> cfg = [];
> cfg.dataset = 'dataset';
> cfg.trialdef.....
> % all the trial definition options go here
> cfgout = ft_definetrial(cfg);
>
> and then just save the output trl matrix:
>
> trl = cfgout.trl;
>
> now you can call ft_redefinetrial:
>
> cfg = [];
> cfg.trl = trl;
> data = ft_redefinetrial(cfg, data);
>
> and your data will be segmented.
>
> Hope this helps,
> Best,
>
> Eelke
>
>
> On 16 May 2013 08:28, Beom Jun Min <mbj0310 at gmail.com> wrote:
> >
> > Dear all,
> >
> > Hello, my name is BJ Min from Korea.
> >
> > I am just a beginner in the Fieldtrip.
> > Anyway, with the help of tutorials, I could make grand average ERP of my
> > data finally.
> >
> > However, my question is about the order of preprocessing. According to
> the
> > tutorials, and examples, it looks the ft_definetrial step is the first,
> then
> > ft_preprocessing step is followed.  But, is there any method to flip
> these
> > two steps? What I want to do is preprocessing (filtering, notch
> filtering)
> > first then to use ft_definetrial sequentially.
> >
> > Best regards
> >
> >
> > BeomJun Min, M.D.
> >
> > Ph. D. student, Department of Medical System Engineering (DMSE)
> > Gwangju Institute of Science and Technology (GIST)
> > 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju
> > 500-712, Republic of Korea (South)
> > Phone: +82-62-715-3266 / Fax: +82-62-715-3244
> > E-mail: mbj0310 at gmail.com, http://bmssa.gist.ac.kr
> >
> >
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-- 
BeomJun Min, M.D.

Department of Medical System Engineering (DMSE)
Gwangju Institute of Science and Technology (GIST)
261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju
500-712, Republic of Korea (South)
Phone: +82-62-715-3266 / Fax: +82-62-715-3244
E-mail: mbj0310 at gmail.com, http://bmssa.gist.ac.kr
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