[Mne_analysis] Overwriting data in raw fif file

[Alexandre Gramfort]

Hi Gladia,

> I have some data saved in a matlab array that I'd like to do source
> localization on. I was thinking of replacing the data in an existing raw fif
> file (created in mne-python by reading in a brainvision file) with the
> matlab data, so that the subject-specific info and other parameters in the
> mne raw object will be preserved. I'm doing this using:
>
> rawcopy = raw.copy()
> rawcopy._data = matlabdata

yes that will work but you'll need channel locations for source reconstruction.

> I noticed that raw._data is in a 'memmap' format, whereas matlab data read
> into Python is in the 'array' format. Is it ok to replace the memmap data
> with the array data as I'm doing above, or will it cause processing
> problems? What's the difference between the memmap and array formats?

memmap allows to have the data on disk and not in memory.

HTH
Alex

> Thanks and Best Regards,
> Gladia
>
>
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