Add option to save/export raw to .mat

I’m thinking of adding an option to save a raw object (or at least the most essential information, such as the data, channel names, sampling frequency, etc.) to a .mat file in MNELAB. However, this might be something that could also be added directly to MNE. I’d probably add a new raw.export method, because raw.save saves all information to a FIFF file whereas I’m planning to export just the most essential fields (at least for now).

WDYT? Would this be something for MNE or should I rather add it to MNELAB?

[cbrnr]

I’ve implemented it in MNELAB. Basic export to .set works, including the data, channel names, sampling frequency, and events (converted from annotations). If anyone wants to give it a try and let me know if it works I’d be very happy (maybe @mmagnuski since you have indicated that you would be interested in a GUI for MNE?). Note that I expect that this works best with MNE 0.18, because otherwise synthesized stim channels get in the way. If we want that in MNE, I’m happy to port it over.

[cbrnr]

FYI, export to EDF also works in MNELAB (if pyedflib is installed), including annotations. I just didn’t find a way to write non-integer duration files (e.g. 20.2 seconds), because pyedflib always seems to write in increments of 1 second…