[Mne_analysis] Manipulating Channels on Raw Preloaded to Workfile

Eric Larson larson.eric.d at gmail.com
Tue Jul 31 12:42:42 EDT 2018
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We probably do not handle preload-as-str properly. Can you open an MNE
issue about this on GitHub?

Eric


On Tue, Jul 31, 2018 at 12:34 PM Rockhill, Alexander P. <
AROCKHILL at mgh.harvard.edu> wrote:

> Hi all,
>
>     I have a very large Raw file (several hours sampled at 25 kHz) and the
> analysis depends on not decimating the data. I have been trying to use a
> memory-mapped file but when I add channels, I get the error:
>
> >>> raw.add_channels([Cz], force_update_info=False)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File
> "/autofs/space/karima_001/users/alex/software/anaconda2/lib/python2.7/site-packages/mne/channels/channels.py",
> line 877, in add_channels
>     data = np.concatenate(data, axis=con_axis)
> MemoryError
>
>     If anyone has helpful information about a way around this, I would
> appreciate it greatly.
>
> Thanks,
>
> Alex Rockhill
>
> Translational NeuroEngineering Laboratory
> Division of Neurotherapeutics, Department of Psychiatry
> Massachusetts General Hospital, Martinos Center
> 149 13th St Charlestown #2301, Boston, MA 02129
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