[FieldTrip] ft_denoise_synthetic 3rd order grad

[Stan van Pelt]

Hi Barbara, I can replicate your finding, but am unsure what is causing it. Maybe the difference/correction is lower than the Matlab or CTF precision? In any case, i f the 3rd order gradients were on, ft_denoise_synthetic would undo the G3BR-balancing, ergo it toggles. Best, Stan ----- Oorspronkelijk bericht -----
> Van: "Michael Wibral" <michael.wibral at web.de>
> Aan: "Email discussion list for the FieldTrip project"
> <fieldtrip at donders.ru.nl>
> Verzonden: Maandag 16 april 2012 16:46:27
> Onderwerp: Re: [FieldTrip] ft_denoise_synthetic 3rd order grad
> Hi Barbara,
> are you certain that the original data do not have 3rd gradients
> enabled? - looking at them once in dataEditor, switching to 3rd grads
> and accidentally forgetting to unclick 'save parameters with dataset'
> will make them have 3rd grads...
> When I last used ft_denoise_synthetic it worked pretty much as
> described (??).
> Michael
> Gesendet: Montag, 16. April 2012 um 15:56 Uhr
> Von: "Barbara Haendel" <B.Haendel at gmx.net>
> An: fieldtrip at donders.ru.nl
> Betreff: [FieldTrip] ft_denoise_synthetic 3rd order grad
> Dear fieldtrip users,
> has anyone experience in using ft_denoise_synthetic? If I try to
> calculate 3rd order grads in the below specified way the data does not
> change with respect to the input data (which has no synthetic
> gradiometer applied). Is there some obvious misunderstanding on my
> side of how to use this function or is our environment truly noiseless
> :)
> Cheers,
> Barbara
> cfg=[];
> cfg.gradient ='G3BR';
> cfg.trials = 'all';
> data_3rdorder = ft_denoise_synthetic(cfg, dataprepro);
> >> data_3rdorder.grad.balance
> ans =
> G1BR: [1x1 struct]
> G2BR: [1x1 struct]
> G3BR: [1x1 struct]
> current: 'G3BR'
> previous: {'none'}
> >> sum(dataprepro.trial{8}(30,:)-data_3rdorder.trial{8}(30,:))
> ans = 0
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-- Stan van Pelt Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Kapittelweg 29, 6525 EN Nijmegen, Netherlands E-mail: stan.vanpelt at donders.ru.nl Website: www.ru.nl/donders/ Phone: (+31) (0)24 36 10981 Fax: (+31) (0)24 36 10989 
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