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Hello girls and guys,<br>
<br>
It is working for my CTF MEG data - the version that I have is v4692
2011-11-07.<br>
<br>
The other thing that might cause a problem could be ommiting the
reference channels definition before the ft_ preprocessing command
that gave you your "dataprepro"<br>
<br>
i.e maybe you might need something like this <br>
<br>
cfg = [];<br>
<br>
...<br>
//various preprocessing parameters<br>
...<br>
<br>
cfg.channel = {'MEG', 'MEGREF', 'REFGRAD' , 'REFMAG'};<br>
<br>
dataprepro = ft_preprocessing(cfg);<br>
<br>
<br>
Hope you are lucky :)<br>
<br>
Best,<br>
Panagiotis<br>
<br>
<br>
On 4/16/2012 4:59 PM, Stan van Pelt wrote:
<blockquote
cite="mid:95345142.24585.1334588365133.JavaMail.root@sculptor.zimbra.ru.nl"
type="cite">
<style type="text/css">p { margin: 0; }</style>
<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" <a class="moz-txt-link-rfc2396E" href="mailto:michael.wibral@web.de"><michael.wibral@web.de></a><br>
<b>Aan: </b>"Email discussion list for the FieldTrip
project" <a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@donders.ru.nl"><fieldtrip@donders.ru.nl></a><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>
<br>
<div style="margin:10px 5px 5px 10px; padding: 10px 0 10px
10px; border-left:2px solid #C3D9E5; word-wrap:
break-word; -webkit-nbsp-mode: space; -webkit-line-break:
after-white-space;">
<div style="margin:0 0 10px 0;"> <b>Gesendet:</b> Montag,
16. April 2012 um 15:56 Uhr<br>
<b>Von:</b> "Barbara Haendel" <a class="moz-txt-link-rfc2396E" href="mailto:B.Haendel@gmx.net"><B.Haendel@gmx.net></a><br>
<b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>
<b>Betreff:</b> [FieldTrip] ft_denoise_synthetic 3rd
order grad </div>
<div> <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>
<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: <a class="moz-txt-link-abbreviated" href="mailto:stan.vanpelt@donders.ru.nl">stan.vanpelt@donders.ru.nl</a><br>
Website: <a class="moz-txt-link-abbreviated" href="http://www.ru.nl/donders/">www.ru.nl/donders/</a><br>
Phone: (+31) (0)24 36 10981<br>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Panagiotis S. Tsiatsis
Max Planck Institute for Biological Cybernetics
Cognitive NeuroImaging Group
Tuebingen, Germany</pre>
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