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<p>Dear Julian,</p>
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<p>Thanks a lot for your help!</p>
<p>From looking into the function as you suggested, it seems the transformation matrix is actually 4 dimensional, with one extra dimension for scaling. I managed to rotate the sensors but they are still quite far away from the headvolume.<br>
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<p>I tried using <span>ft_sensorrealign</span> (MEG equivalent of <span>ft_electroderealign</span>) but am getting an errormessage
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<div>Undefined function or variable "pnt".<br>
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Error in channelposition (line 327)<br>
pnt = pnt(sel2, :);</div>
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<div>which I haven't had time to follow up yet. I will post more once I have looked into it.</div>
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<p>Anyway, thanks again for the help so far.</p>
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<p>Cheers,</p>
<p>Ulrich<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> fieldtrip-bounces@science.ru.nl <fieldtrip-bounces@science.ru.nl> on behalf of Julian Keil <julian.keil@gmail.com><br>
<b>Sent:</b> 12 May 2017 08:44<br>
<b>To:</b> FieldTrip discussion list<br>
<b>Subject:</b> Re: [FieldTrip] Rotating sensors using ft_transform_sens</font>
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<div>Dear Ulrich,
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<div>could you use ft_electroderealign with the interactive-option instead?</div>
<div>Here you have an graphic interface that lets you rotate the electrodes in all directions to match your headshape.</div>
<div>ft_transform_sens is used in this function, so the output should be the same.</div>
<div>Moreover, if you check the code of ft_electroderealign, it can give you a hint to what the transform-matrix should look like: I think it should be a 3x3-matrix with scale, transform and rotate xyz-vectors.</div>
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<div>I hope this helps,</div>
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<div>Julian</div>
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<div>Am 11.05.2017 um 19:21 schrieb Pomper, Ulrich:</div>
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<div style="margin-top:0px; margin-bottom:0px">Dear Listmembers,</div>
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<div style="margin-top:0px; margin-bottom:0px">Could someone please explain how to use ft_transform_sens in order to rotate sensors around a given axis?</div>
<div style="margin-top:0px; margin-bottom:0px">For example, how would the input variable 'transform' need to look like in order to perform a 90 degree rotation around the z-axis?</div>
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<div style="margin-top:0px; margin-bottom:0px">Many thanks,</div>
Ulrich</div>
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