[Mne_analysis] epochs with no data?

[Dillan Cellier]

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Hi Denis,

The events are 2 seconds apart from each other.

Thanks!

Dillan

On Fri, Jan 4, 2019 at 3:18 PM Denis A. Engemann <
denis-alexander.engemann at inria.fr> wrote:

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>
> Hi Dillan,
>
> What is then the distance in seconds between any two events that you
> passed to the epochs constructor?
>
> Denis
>
> On 4 Jan 2019, at 22:12, Dillan Cellier <cellierdillan at gmail.com> wrote:
>
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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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