[FieldTrip] cfg.trialfun in realtime functions

[Hamza Fawzi Altakroury (Student)]

Thank you for your help Stephen

Hamza

On Thu, May 10, 2012 at 4:07 PM, Stephen Whitmarsh <
stephen.whitmarsh at gmail.com> wrote:

> Hi Hamza,
>
> I just saw you've been posting on the FT list for quite a while and
> have been working on offline analysis already. To answer your question
> more specifically: The trialfunction could be very simple in the first
> instance, but is needed to know what samples to read when
> preprocessing the data. You can find some examples here that you can
> adapt to your own purpose here:
>
> http://fieldtrip.fcdonders.nl/example/making_your_own_trialfun_for_conditional_trial_definition
>
> Cheers,
> Stephen
>
> On 10 May 2012 14:51, Stephen Whitmarsh <stephen.whitmarsh at gmail.com>
> wrote:
> > Dear Hamza,
> >
> > The trialfunction is an integral part of processing data in FieldTrip.
> > It is how you define your timepoints of interest, i.e. trials based on
> > recorded markers in your data, or based on user-defined events (e.g.
> > sleep stages).
> >
> > If you are not yet familiar with the basic FieldTrip operations the
> > documentation of the realtime analysis  might indeed seem somewhat
> > inadequate as it assumes this familiarity. FieldTrip's online analysis
> > tools are using many of the same functions of the offline ones, and
> > has a similar overall philosophy and approach. This makes it
> > relatively easy to understand and to use online analysis approach once
> > one is familiar with the offline one. Alas this translation is
> > assymmetric and doesn't hold for the other way around.
> >
> > The good news is, however, that everything is there to get you on your
> > way once your take a little detour. You could take a look at the
> > tutorial documentation (http://fieldtrip.fcdonders.nl/tutorial) and
> > get a bit of hands-on working through some steps with the supplied
> > tutorial-data.
> >
> > Specifically for your question these pages would be relevant:
> >
> http://fieldtrip.fcdonders.nl/example/getting_started_with_reading_raw_eeg_or_meg_data
> > http://fieldtrip.fcdonders.nl/tutorial/preprocessing
> > http://fieldtrip.fcdonders.nl/tutorial/continuous
> >
> > For more overview and general operations I would advice reading through:
> > http://fieldtrip.fcdonders.nl/walkthrough
> >
> > Most of all it might not be a bad idea to start with a pre-recorded
> > dataset and work on it offline, using the more standard and more
> > extensively documented offline functions for e.g. trial based
> > averaging. Once that works out for you can adapt it to the realtime
> > situation.
> >
> > Hope this helps,
> > Stephen
> >
> > On 10 May 2012 13:55, Hamza Fawzi Altakroury (Student)
> > <hamzaf at sabanciuniv.edu> wrote:
> >> Hello,
> >>
> >> I don't know why should I define a function inside the
> >> ft_realtime_selectiveaverage.
> >> I just want to make an average of some segments.
> >>
> >> Could you provide me with an example of cfg.trialfun
> >>
> >> Hamza
> >>
> >>
> >> On Wed, May 9, 2012 at 11:33 AM, Hamza Fawzi Altakroury (Student)
> >> <hamzaf at sabanciuniv.edu> wrote:
> >>>
> >>> Hello,
> >>>
> >>> I am doing realtime processing, and I wanted to check
> ft_realtime_average
> >>> function and ft_realtime_selectiveaverage functions.
> >>>
> >>> I faced a problem in defining cfg.trialfun
> >>>
> >>> Could you help me
> >>>
> >>> Best
> >>>
> >>> --
> >>> Hamza Fawzi Altakroury
> >>> Graduate student - MA
> >>> Faculty of Engineering and Natural Sciences
> >>> Sabancı University
> >>
> >>
> >>
> >>
> >> --
> >> Hamza Fawzi Altakroury
> >> Graduate student - MA
> >> Faculty of Engineering and Natural Sciences
> >> Sabancı University
> >>
> >> _______________________________________________
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> >> fieldtrip at donders.ru.nl
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>
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-- 
Hamza Fawzi Altakroury
Graduate student - MA
Faculty of Engineering and Natural Sciences
Sabancı University
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