[FieldTrip] creating new dataset

["Jörn M. Horschig"]

Hi Jessie,

not quite sure what you are up to by saying that you do not want to use 
ft_ functions for that (maybe I misunderstood that part). Of course you 
could write your own loop, but the easier option would be to call 
ft_channelselection on your data and then call ft_preprocessing (this 
will return a new data-structure). See the help of these 
ft_channelselection:

You can also exclude channels or channel groups using the following syntax
     {'all', '-POz', '-Fp1', -EOG'}



 From ft_preprocessing:

If you are callingFT_PREPROCESSING  <http://fieldtrip.fcdonders.nl/reference/ft_preprocessing>  with also the second input argument
   "data", then that should contain data that was already read from file in
   a previous call toFT_PREPROCESSING  <http://fieldtrip.fcdonders.nl/reference/ft_preprocessing>. In that case only the configuration
   options below apply.

   The channels that will be read and/or preprocessed are specified with
     cfg.channel      = Nx1 cell-array with selection of channels (default = 'all'),
                        seeFT_CHANNELSELECTION  <http://fieldtrip.fcdonders.nl/reference/ft_channelselection>  for details



You could also use ft_selectdata instead of ft_preprocessing in case you 
are handling already processed data (e.g. tfr-data ). Alternatively, you 
can check ft_channelrepair for interpolating the bad channels.

Hope this all helps to what you are up to!
Best,
Jörn

On 9/24/2011 10:12 PM, Luo, Jessie (NIH/NIMH) [V] wrote:
> Hi,
>
> If there are bad channels (e.g. for a 4D system) in a dataset, Is it possible to create a new dataset by excluding them? I meant creating a NEW dataset  without those channels (not by defining them using the ft_... in fieldtrip).
>
> Thanks,
>
> Jessie
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
E-Mail: jm.horschig at donders.ru.nl
Tel:    +31-(0)24-36-68493
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Visiting address:
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