[Mne_analysis] load digitization electrodes

[Teon Brooks]

glad that worked.

`read_dig_montage` was initially designed to deal with peripheral digitized
data such as headshape (hsp), hpi coil placement in device space (hpi),
fiducials and hpi points in head space (elp). It's been adapted to handle
some digitized electrode data but that currently supports points saved in
the .fif file (fif) and egi files (egi).

HTH,

On Tue, Feb 13, 2018 at 2:23 PM, Edoardo Pinzuti <edoardo.pinzuti at gmail.com>
wrote:

> I solved with read_montage but I did not understand why  read_dig_montage
> did not work.
>
> Thanks a lot for the help
>
>
>
> 2018-02-13 20:55 GMT+01:00 Teon Brooks <teon.brooks at gmail.com>:
>
>> Hey Edoardo,
>>
>> There are two possible solutions for this. You can use the `read_montage`
>> function and construct an `.hpts` file. It's a four column space delimited
>> text file with the given extension. You can set the unit parameter to 'm',
>> 'mm', 'cm'. You can then use the `set_montage` as Marijn suggested. Each
>> line should be as follow:
>>
>> eeg Fp1 -95.0 -3. -3
>>
>> The other solution would be to construct a fif file with the digitized
>> electrode information. For this, I don't know how to advise you.
>>
>> HTH,
>>
>> On Tue, Feb 13, 2018 at 1:40 AM, Edoardo Pinzuti <
>> edoardo.pinzuti at gmail.com> wrote:
>>
>>> Dear Marijn
>>>
>>> thanks. Did not help. If I print digitization I see channels 0.   Should
>>> the dig montage look different?
>>>
>>> <DigMontage | 57 extras (headshape), 54 HPIs, 3 fiducials, 0 channels>
>>>
>>> 2018-02-12 23:27 GMT+01:00 Marijn van Vliet <w.m.vanvliet at gmail.com>:
>>>
>>>> Hi Edoardo,
>>>>
>>>> try: epochs.set_montage(digitization, set_dig=True)
>>>>
>>>> best,
>>>> Marijn.
>>>>
>>>> > On 13 Feb 2018, at 00:50, Edoardo Pinzuti <edoardo.pinzuti at gmail.com>
>>>> wrote:
>>>> >
>>>> > Dear everyone,
>>>> >
>>>> > I have a problem in loading the digitization of electrode in the
>>>> epochs objects.
>>>> >
>>>> > I created the epochs
>>>> > info = create_info(chan_names, sfreq, chan_types )
>>>> > epochs = EpochsArray(data, info, events=None, tmin=np.min(time),
>>>> verbose=False)
>>>> >
>>>> > digitization = read_dig_montage(hsp=positions.copy(),
>>>> elp=positions.copy(), point_names=labels, unit='mm')
>>>> > epochs.set_montage(digitization)
>>>> > epochs.plot_sensors()
>>>> >
>>>> > when I tried to plot:
>>>> > I got this error: RuntimeError: Did not find any digitization points
>>>> of kind FIFFV_POINT_EEG (3) in the info.
>>>> >
>>>> > How I can solve this?
>>>> >
>>>> > Thanks a lot
>>>> >
>>>> > Edoardo
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>>
>>
>> --
>> teon <http://www.twitter.com/teon_io>, phd
>>
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-- 
teon <http://www.twitter.com/teon_io>, phd
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