[FieldTrip] What exactly does filterpadding do?

[Diego Lozano-Soldevilla]

Dear Julia,

>From the FAQ section:

http://www.fieldtriptoolbox.org/faq/how_does_the_filter_padding_in_preprocessing_work
http://www.fieldtriptoolbox.org/faq/how_can_i_interpret_the_different_types_of_padding_that_i_find_when_dealing_with_artifacts

I hope that helps,

Diego



On 2 May 2016 at 15:08, Brehm, J. (Julia) <j.brehm at uu.nl> wrote:

> Dear list,
>
> I am having problems applying filterpadding when using ft_artifact_zvalue.
>
> Could someone please explain what exactly the effect of filterpadding is,
> and in which cases I can apply it and in which not?
>
> I intended to use it to avoid edge effects in the artifact detection.
> However, I get the following warning (only when applying fltpadding, my
> data does not actually contain NaNs):
>
> Warning: data contains NaNs, no filtering or preprocessing applied
> > In ft_warning (line 181)
>   In preproc (line 282)
>   In ft_artifact_zvalue (line 292)
>
> These are my settings:
> cfg            = [];
> cfg.trl        = temptrl; % all trials
>
> cfg.artfctdef.zvalue.channel     = channel{ch};  % single channel
> cfg.artfctdef.zvalue.cutoff      = 3;
> cfg.artfctdef.zvalue.fltpadding  = 0.1;
>
> cfg.artfctdef.zvalue.bpfilter   = 'yes';
> cfg.artfctdef.zvalue.bpfilttype = 'but';
> cfg.artfctdef.zvalue.bpfreq     = [1 3];
> cfg.artfctdef.zvalue.bpfiltord  = 2;
> cfg.artfctdef.zvalue.hilbert    = 'yes';
>
> Thanks!
>
> Best,
> Julia
>
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