A function get_ch_positions for DigMontage

Describe the new feature or enhancement

If I have an existing montage and want to add fiducials, there is currently no way to do that without calling make_dig_montage again. But the montage itself does not provide a way to get the ch positions.

Currently the only way I can find that gets a montage is either you make it from scratch make_dig_montage or you get it from raw using raw.get_montage. But if you say already have an existing montage via raw.get_montage() it seems you would have to hack out the channel positions and then call make_dig_montage again? Since there is no public API for getting the channel positions, I wonder if there’s an easier way around this?

Describe your proposed implementation

Possibly a get_ch_positions() public function for DigMontage, that one can then do:

montage  = raw.get_montage()
ch_positions = montage.get_ch_positions()

Additional comments

TBD

[larsoner]

In that case we should just make it get_positions(), and doing mon_2 = make_dig_montage(**mon.get_positions()) should have all attributes of mon and mon_2 the same. If you want the channel positions you just use mon.get_positions()['ch_pos']

[larsoner]

That code operates on an info object. There is no info as part of DigMontage