[FieldTrip] timelock grand average can't average gradiometers?

[Eelke Spaak]

Hi Eli,

The warning message you mention regards the information about the
gradiometer positions, i.e. the information in the data.grad field.
The MEG-data recorded by the gradiometer sensors will still be
averaged.

I understand the confusion, though, and agree that the message could
be a bit clearer.

Best,
Eelke

2011/8/3 Kanal Eliezer <ekanal at cmu.edu>:
> Hello all -
>
> I'm trying to average a number of datasets collected from a Neuromag scanner. This dataset contains both magnetometer and gradiometer data. I'm trying to use ft_timelockgrandaverage to average the cleaned data, and I'm getting the following error message:
>
>> Warning: discarding gradiometer information because it cannot be averaged
>
> My question is, why not? My gradiometer data isn't different than the magnetometer data. Even more confusing, when looking in the code, it looks like it's averaging it anyway, and the resulting dataset seems to contain averaged grad data. What's the purpose of this error?
>
> Thanks,
> Eliezer Kanal
>
>
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