[FieldTrip] fieldtrip Digest, Vol 78, Issue 13

[Laxmi Shaw]

Dear Fieldtrip Users,
I am using fieldtrip plot function, and it was running fine. Last two days
back the code is showing some error, and I am not able to figure it out.
Could you please help me in this regard. I have attached the screen shot of
that error window. Please find the screenshot.



Thanks and Regards[image: Inline image 1]

On Mon, May 15, 2017 at 3:30 PM, <fieldtrip-request at science.ru.nl> wrote:

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> Today's Topics:
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>    1. Re: Rotating sensors using ft_transform_sens (Pomper, Ulrich)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 14 May 2017 11:36:13 +0000
> From: "Pomper, Ulrich" <u.pomper at ucl.ac.uk>
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> Subject: Re: [FieldTrip] Rotating sensors using ft_transform_sens
> Message-ID:
>         <AM5PR01MB2979106D172D9C99CAE4E2E0D2E00 at AM5PR01MB2979.
> eurprd01.prod.exchangelabs.com>
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> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Julian,
>
>
> Thanks a lot for your help!
>
> >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.
>
> I tried using ft_sensorrealign (MEG equivalent of ft_electroderealign) but
> am getting an errormessage
>
>
> Undefined function or variable "pnt".
>
> Error in channelposition (line 327)
> pnt = pnt(sel2, :);
>
>
>
> which I haven't had time to follow up yet. I will post more once I have
> looked into it.
>
> Anyway, thanks again for the help so far.
>
>
> Cheers,
>
> Ulrich
>
>
>
> ________________________________
> From: fieldtrip-bounces at science.ru.nl <fieldtrip-bounces at science.ru.nl>
> on behalf of Julian Keil <julian.keil at gmail.com>
> Sent: 12 May 2017 08:44
> To: FieldTrip discussion list
> Subject: Re: [FieldTrip] Rotating sensors using ft_transform_sens
>
> Dear Ulrich,
>
> could you use ft_electroderealign with the interactive-option instead?
> Here you have an graphic interface that lets you rotate the electrodes in
> all directions to match your headshape.
> ft_transform_sens is used in this function, so the output should be the
> same.
> 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.
>
> I hope this helps,
>
> Julian
>
>
> Am 11.05.2017 um 19:21 schrieb Pomper, Ulrich:
>
> Dear Listmembers,
>
> Could someone please explain how to use ft_transform_sens in order to
> rotate sensors around a given axis?
> For example, how would the input variable 'transform' need to look like in
> order to perform a 90 degree rotation around the z-axis?
>
> Many thanks,
> Ulrich
>
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> End of fieldtrip Digest, Vol 78, Issue 13
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>



-- 
Laxmi Shaw
Research Scholar(PhD)
IIT Kharagpur
West Bengal
Ph no-08388837821
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