[Mne_analysis] Get back a reference channel from acticap

[Sik]

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I'm not familiar with the processing pipeline, but if you drop us an
example file I'll try to see why FCz is dropped.

On Tue, Oct 16, 2018 at 3:06 PM Sylvain <madec at uni-potsdam.de> wrote:

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>
> Dear mne users,
>
> I used an acticap system to collect data. This system has a common
> reference electrode localized on the FCz location. I would like to retrieve
> this electrode for further analysis,
>
> What I would like to do is as follow:
> - adding back the reference channel by using
> mne.add_reference_channels(raw, 'FCz'), which I guess should add this
> channel with values equal to zeros;
> - then computing the average reference of all channel by using
> raw.set_eeg_reference('average') So I guess the values on the FCz channels
> should just be 0 minus the mean of all other channels;;
> - then well maybe I will use the linked mastoid average or I will stay
> with the average one.
>
> OK so the issues I have right now:
> - could anyone confirm my rationale makes sense?
> - second I have troubles with  mne.add_reference_channels. For some
> reasons when I apply it I get an error "RuntimeWarning: the locations of
> multiple reference channels are ignored (set to zeros)". And apparently it
> is not updating the info structure.
>
> Thank you for any help!
>
> Sylvain
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