[FieldTrip] filter in-memory trials data with mirroring

["Jörn M. Horschig"]

Hi Robin,

yep, that sounds pretty much like a bug to me. Would you mind creating a 
bug on bugzilla for this?
http://bugzilla.fcdonders.nl/
I will try to look into this next week. Thanks so far for reporting this.

Best,
Jörn

On 4/26/2013 11:11 AM, Robin wrote:
>
> Hello,
>
> Is it possible filter in-memory extracted trials data with mirroring 
> at the edges?
>
> When I try:
>
> |% filter
> cfg =[];
> cfg.lpfilter ='yes';
> cfg.lpfreq ='40';
> cfg.lpfilttype ='but';
> cfg.padtype ='mirror';
> % trial length is 1.1s so mirror-pad to 1.5s (200ms each side)
> cfg.padding =1.5;
> flt_data = ft_preprocessing(cfg, block_data);|
>
> I get:
>
> |Reference to non-existent field 'Fs'.
>
> Error in ft_preprocessing (line 288)
>        padding = round(cfg.padding * data.Fs);|
>
> Adding |block_data.Fs = block_data.fsample;| seems to work. But in the 
> resulting data structure the time vectors no longer match the trial 
> data, so obviously something is going wrong:
>
> |>> size(block_data.time{1})
>
> ans =
>
>       1   560
>
> >> size(block_data.trial{1})
>
> ans =
>
>     234   560
>
> >> size(flt_data.trial{1})
>
> ans =
>
>     234   560
>
> >> size(flt_data.time{1})
>
> ans =
>
>       1   357|
>
> Is there a correct way to do this? (Filter trials with mirrored edges)
>
> Thanks,
>
> Robin
>
>
>
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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
FieldTrip Development Team

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
Web: http://www.ru.nl/donders

Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands

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