[FieldTrip] Dealing with warning message "data contians NaN values"

[Erika Puiutta]

Hey J,

this is just an educated guess since I don't really know how fieldtrip does the downsampling, but what is your sampling frequency and the sampling frequency you sample down to? Is it possible that your downsampling frequency is not a harmonic of your original sampling frequency (say 1000Hz to 300Hz)? Maybe there are NaNs for the new samples where fieldtrip can't find a corresponding one from the old sampling frequency?

Best of luck,
Erika

> Am 17.07.2019 um 17:26 schrieb Jeremy Pulmano <jpulmano at princeton.edu>:
> 
> Hi all,
> 
> I am new to both neuroscience and FieldTrip and am trying to debug my preprocessing pipeline of EEG data (biosemi .bdf files). These are the current steps:
> High pass filtering
> Downsampling
> Epoching
> Base-line correction
> Re-referencing
> ICA / component rejection
> Visual artifact removal
> Low pass filter (I save the low pass filter for the end so that ICA yields better time course plots).
> However, after the first three steps (high pass, downsample, epoch), I continue to get the warning message: "Warning: data contains NaN values, no filtering or preprocessing applied," starting at baseline correction. It repeats itself over and over again. If I ignore these errors, the data looks incorrect in the end. Why does this happen, and how can I resolve this?
> 
> Any tips would be appreciated.
> 
> Thanks,
> J
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> https://doi.org/10.1371/journal.pcbi.1002202
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