[FieldTrip] Filtering before epoching

[Matthieu Rolland]

Thank you!

On 12/09/13 23:57, jan-mathijs schoffelen wrote:
> Hi Matt,
>
> Yes, it's possible. The only thing you should change in your approach 
> is step 3: use ft_redefinetrial, rather than ft_preprocessing
>
> So:
>
> 1. Preprocessing step on continuous data with filtering.
> /cfg=[];//
> //cfg.dataset  = 'raw_data.fif';//
> //cfg.bpfilter  = 'yes';//
> //cfg.bpfreq    = [a b];//
> //data = ft_preprocessing(cfg);/
>
> 2. Define trial.
> /
> /
> /cfg = [];/
> /cfg.dataset = 'blabla';/
> /cfg.trialdef.xxx etc some settings here./
> /cfg   =//ft_definetrial(cfg);/
> trl = cfg.trl;
>
> 3. Preprocessing step for epoching data on filtered data.
> /
> /
> /cfg = [];/
> /cfg.trl = trl;/
> /final_data = ft_redefinetrial(cfg,data);/
>
>
> Best,
> JM
>
> On Dec 9, 2013, at 6:31 PM, Matthieu Rolland wrote:
>
>> Hi everybody,
>>
>> Is it possible to filter data prior to epoching? And more generally 
>> is it possible to epoch data that has already been preprocessed?
>>
>> I have tried without success many variations of this:
>>
>> 1. Preprocessing step on continuous data with filtering.
>> /cfg=[];//
>> //cfg.dataset  = 'raw_data.fif';//
>> //cfg.bpfilter  = 'yes';//
>> //cfg.bpfreq    = [a b];//
>> //data = ft_preprocessing(cfg);/
>>
>> 2. Define trial.
>> /cfg   =//  ft_definetrial(cfg);/
>>
>> 3. Preprocessing step for epoching data on filtered data.
>> /final_data = ft_preprocessing(cfg,data);/
>>
>>
>> Thank you for your help.
>> Matt
>>
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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 <mailto:J.Schoffelen at donders.ru.nl>
> Telephone: +31-24-3614793
>
> http://www.hettaligebrein.nl
>
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

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