[Mne_analysis] Coordinates of dipoles in fwd['sol']['data']?

Fri May 7 07:45:29 EDT 2021

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yes it's like this

Alex

On Fri, May 7, 2021 at 11:49 AM Karin Westin <karin.westin85 at gmail.com>
wrote:

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>
> Just one follow up question... how is the free orientation forward matrix
> arranged, ie do columns 1-3 include three orientations for dipole 1, 2-6
> for dipole 2 and so on?
>
> Karin
>
> Den tors 6 maj 2021 kl 13:17 skrev Eric Larson <larson.eric.d at gmail.com>:
>
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>>
>> The forward is free orientation, i.e., 3 directions per location. 16382 *
>> 2 * 3 = 98292.
>>
>> I'm guessing you actually have (98292 - 98268) / 3 = 8 fewer locations in
>> the left hemisphere (i.e., 16374) than in the right (16382)?
>>
>> Eric
>>
>>
>> On Thu, May 6, 2021 at 6:05 AM Karin Westin <karin.westin85 at gmail.com>
>> wrote:
>>
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>>>
>>> But 16382 dipoles per hemisphere don’t add up to the 98267 dipoles of
>>> the forward matrix?
>>>
>>> Skickat från min iPhone
>>>
>>> 6 maj 2021 kl. 10:58 skrev Karin Westin <karin.westin85 at gmail.com>:
>>>
>>> Thank you for your answer!
>>>
>>> But from that I get
>>>  np.shape(right_coords)  (16382, 3) and
>>> np.shape(fwd['sol']['data'])  (130, 98268)
>>>
>>> so I still don't understand how to extract coordinates of dipole in
>>> column j of fwd['sol']['data']?
>>>
>>> Thanks in advance,
>>> Karin
>>>
>>> Den tors 6 maj 2021 kl 07:54 skrev VERRIER Clement <
>>> clement.VERRIER at univ-amu.fr>:
>>>
>>>>         External Email - Use Caution
>>>>
>>>> Hello,
>>>>
>>>> You should be able to extract the dipoles coordinates of each
>>>> hemisphere using the following (works with version 0.22.1):
>>>>
>>>> >>> left_hemi, right_hemi = fwd["src"]
>>>> >>> left_coords, right_coords = [hemi["rr"][hemi["vertno"]] for hemi in
>>>> [left_hemi, right_hemi]]
>>>>
>>>> If you want all coordinates (i.e. those associated with the
>>>> nondecimated mesh), you just have to use remove the extra
>>>> hemi["vertno"] slicing.
>>>>
>>>> Hope it helps!
>>>>
>>>> Best,
>>>> Clément
>>>>
>>>>
>>>> On 6 May 2021, at 12:54 AM, Karin Westin <karin.westin85 at gmail.com>
>>>> wrote:
>>>>
>>>>         External Email - Use Caution
>>>>
>>>> Hi all!
>>>>
>>>> As I understood it, the matrix fwd['sol']['data'] represents sensors x
>>>> dipoles. How can one extract the coordinates of these dipoles?
>>>>
>>>> Thanks in advance,
>>>> Karin
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