[Mne_analysis] EEG channel positions

[Denis-Alexander Engemann]

Hi Rezvan,

can you figure out what these channels are. My suspicion would be that some
channels are labeled EEG but are in fact EMG, or ECG or some other
physiology readout. These often have no channel positions, hence 0. If this
is the case your solution would be to exclude those channels.

Denis


On Tue, Apr 19, 2016 at 9:24 PM Rezvan Farahi <rezvan.farahi at gmail.com>
wrote:

> Hello,
> I'm trying to interpolate the bad channels but it throws the following
> error since chs['loc'][:3] for a few channels is [0,0,0]:
> ValueError: 'Could not extract channel positions for 4 channels'
>
> I was wondering what could be the reason for this?
>
> And whether or not it would make sense to use positions from raw.info['dig']
> (since I have measured all the EEG channel positions when digitizing)
> together with set_channel_positions to set the missing positions?
> If so, where can I get more info about the structures inside raw.info['dig']
> to make sure which points correspond to the EEG channels
> (e.g. don't know what does "kind" value mean there.)
>
>
> Many thanks,
> Rezvan
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