<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'><div>Hi Barbara,</div><div><br></div><div>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, if the 3rd order gradients were on, ft_denoise_synthetic would undo the G3BR-balancing, ergo it toggles.</div><div><br></div><div>Best,</div><div>Stan</div><div><br><br><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;"><b>Van: </b>"Michael Wibral" <michael.wibral@web.de><br><b>Aan: </b>"Email discussion list for the FieldTrip project" <fieldtrip@donders.ru.nl><br><b>Verzonden: </b>Maandag 16 april 2012 16:46:27<br><b>Onderwerp: </b>Re: [FieldTrip] ft_denoise_synthetic 3rd order grad<br><br>Hi Barbara,<br>
<br>
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...<br>
<br>
When I last used ft_denoise_synthetic it worked pretty much as described (??).<br>
<br>
Michael<br>
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<b>Gesendet:</b> Montag, 16. April 2012 um 15:56 Uhr<br>
<b>Von:</b> "Barbara Haendel" <B.Haendel@gmx.net><br>
<b>An:</b> fieldtrip@donders.ru.nl<br>
<b>Betreff:</b> [FieldTrip] ft_denoise_synthetic 3rd order grad
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<br>
Dear fieldtrip users,<br>
<br>
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 :)<br>
<br>
Cheers,<br>
Barbara<br>
<br>
cfg=[]; <br>
cfg.gradient ='G3BR';<br>
cfg.trials = 'all';<br>
data_3rdorder = ft_denoise_synthetic(cfg, dataprepro);<br>
<br>
<br>
>> data_3rdorder.grad.balance<br>
<br>
ans = <br>
<br>
G1BR: [1x1 struct]<br>
G2BR: [1x1 struct]<br>
G3BR: [1x1 struct]<br>
current: 'G3BR'<br>
previous: {'none'}<br>
<br>
>> sum(dataprepro.trial{8}(30,:)-data_3rdorder.trial{8}(30,:))<br>
<br>
ans = 0<br>
<br>
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<br>_______________________________________________<br>fieldtrip mailing list<br>fieldtrip@donders.ru.nl<br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</blockquote><br><br><br>-- <br><div><span name="x"></span>Stan van Pelt<br><br>Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen<br>Kapittelweg 29, 6525 EN Nijmegen, Netherlands<br>E-mail: stan.vanpelt@donders.ru.nl<br>Website: www.ru.nl/donders/<br>Phone: (+31) (0)24 36 10981<br>Fax: (+31) (0)24 36 10989<span name="x"></span><br></div></div></div></body></html>