<div>Hi Jan-Mathijs, </div>
<div> </div>
<div>From Fieldtrip data structure I saw that the coordinate of A234 is [ -7.2133 9.1712 5.7117]. And it's [14.4320 -0.0683 0.4437] for A121. All these are in "cm". So the distance between the two channels are 24.1172cm. </div>
<div> </div>
<div>I checked 4D's orignial file and found the channel coordinates to agree with what I read from Fieldtrip. So I'm wondering how those coils 24.1172cm apart can be considered neighbours (within 4cms). </div>
<div> </div>
<div>Thanks a lot,</div>
<div> </div>
<div>Jim</div>
<div><br> </div>
<div class="gmail_quote">On Thu, Jun 30, 2011 at 1:50 AM, jan-mathijs schoffelen <span dir="ltr"><<a href="mailto:jan.schoffelen@donders.ru.nl" target="_blank">jan.schoffelen@donders.ru.nl</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style="WORD-WRAP: break-word">Hi Jim, where exactly are they located with respect to the bad channel?
<div><br></div>
<div>Best,</div>
<div><br></div>
<div>Jan-Mathijs<br>
<div><br></div>
<div><br>
<div>
<div>
<div></div>
<div>
<div>On Jun 30, 2011, at 8:05 AM, Jim Li wrote:</div><br></div></div>
<blockquote type="cite">
<div>
<div></div>
<div>
<div>Dear all,</div>
<div> </div>
<div>We have 4D's WH3600 MEG system (248 channels) and we found the </div>
<div>-----------------</div>
<div><font face="Courier New" size="2"><font face="Courier New" size="2">
<p>cfg = [];</p>
<p>cfg.dataset = </p></font></font><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2">'e,rfhp0.1Hz'</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">; </font></font>
<p><font face="Courier New" size="2"><font face="Courier New" size="2">cfg.trialdef.eventtype = </font></font><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2">'TRIGGER'</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">;</font></font></p>
<p>cfg.trialdef.eventvalue = <font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2">320; </font></font></font></p>
<p><font face="Courier New" size="2"><font face="Courier New" size="2">cfg.trialdef.prestim = 1</font></font><font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2">;</font></font></font></p>
<font face="Courier New" size="2"><font face="Courier New" size="2">
<p>cfg.trialdef.poststim = 1</p></font></font><font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2"><font face="Courier New" color="#228b22" size="2">;</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">
<p>cfg = ft_definetrial(cfg);</p>
<p>cfg.blc = </p></font></font><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2">'yes'</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">; </font></font>
<p><font face="Courier New" size="2"><font face="Courier New" size="2">cfg.blcwindow = [-1 0];</font></font></p>
<p>cfg.channel = {<font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2">'MEG'</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">};</font></font></p>
<p>raw_DATA = ft_preprocessing(cfg);</p>
<p>raw_DATA.grad = ft_convert_units(raw_DATA.grad, <font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2"><font face="Courier New" color="#a020f0" size="2">'cm'</font></font></font><font face="Courier New" size="2"><font face="Courier New" size="2">)</font></font></p>
</div>
<div> </div>
<div>cfg = [];<br>cfg.badchannel = {'A234'};<br>[raw_DATA] = ft_channelrepair(cfg, raw_DATA)<br>the input is raw data with 248 channels and 201 trials<br>repairing channel A234<br> using neighbour A121<br> using neighbour A143<br>
using neighbour A154<br> using neighbour A173<br> using neighbour A224<br> using neighbour A8<br> using neighbour A91<br>repairing bad channels for trial 1<br>repairing bad channels for trial 2<br>repairing bad channels for trial 3</div>
<div>...</div>
<div>------------------------------------</div>
<div> </div>
<div>But channels like A121 and A143 are far away from the bad channel A234. How can they be used as neighbours (i.e. within 4cm, the default value for cfg.neighbourdist) for this bad channel?</div>
<div> </div>
<div>Any suggestions?</div>
<div> </div>
<div>Thanks a lot.</div>
<div> </div>
<div>Jim</div></div></div>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></blockquote>
</div><br>
<div><span style="WORD-SPACING: 0px; FONT: medium Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate">
<div style="WORD-WRAP: break-word"><span style="WORD-SPACING: 0px; FONT: medium Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate">
<div style="WORD-WRAP: break-word">
<div>Dr. J.M. (Jan-Mathijs) Schoffelen </div>
<div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div>
<div><a href="mailto:J.Schoffelen@donders.ru.nl" target="_blank">J.Schoffelen@donders.ru.nl</a></div>
<div>Telephone: 0031-24-3614793</div></div></span></div></span></div><br></div></div></div><br>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a><br>
<a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip" target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br></blockquote></div><br>