[Mne_analysis] epochs with no data?

[Dillan Cellier]

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Hi Denis,

I limited the tmin and tmax of the epoch to 0 and 2, respectively, since I
don't any kind of stimulus onset in these epochs and don't want them to
overlap. This is partly what puzzles me, as I would think this would
prevent any inclusion of not-real data. My resting state data can be cut
into 93 two-second time windows, and this the number of events I am feeding
into the epoch object. It is labeling 41 of these 93 as 'NO_DATA'.

Thank you very much!

Dillan

On Fri, Jan 4, 2019 at 3:05 PM Denis A. Engemann <
denis-alexander.engemann at inria.fr> wrote:

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>
> Hi Dillan,
>
> This can happen when the epochs selected include (theoretical) samples
> beyond the (actual) data range. You should not have many of those epochs.
> Can you roughly tell how many no_data labels you found? I‘d need to refresh
> my knowledge of the epochs reading code a bit to see if there may be other
> reasons for this. Let‘s see what the others say in the meantime.
>
> Best,
> Denis
>
> On 4 Jan 2019, at 21:56, Dillan Cellier <cellierdillan at gmail.com> wrote:
>
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>
> Hello again!
>
> Thank you for your responses on my last question, they were very helpful.
> I am running into another problem now, however. I am epoching resting state
> data into arbitrary 2 second windows. I am not automatically rejecting
> epochs by annotation nor by a rejection parameter. I see that the epoch
> object's drop_log is recording nearly the whole first half of the epochs as
> "NO_DATA" epochs, however the raw file contains data for those time
> indices. I am unsure what could be going on to result in this loss of data,
> however it seems especially problematic due to the amount of epochs
> dropped. Thank you in advance, again!
>
> Best wishes,
> Dillan
>
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