[FieldTrip] databrowser and merged data

[Eelke Spaak]

PS: In other words, fixsampleinfo now generates an ad-hoc sampleinfo
with no relation to the original dataset, if requested to do so.
Marco's preprocessing steps are not relevant for this.

2011/8/9 Eelke Spaak <eelke.spaak at donders.ru.nl>:
> Hi Jörn,
>
> As you can read in my email, I actually changed fixsampleinfo so that
> it *does* reconstruct the sample info now :)
>
> I agree that sampleinfo does not make sense in the case of data that
> is (1) timelock-averaged and (2) combined from multiple datasets, but
> the issue here was to get the databrowser working on such data. Since
> the data used internally by the databrowser (after the call to
> ft_checkdata) is never exposed to the user, this seems like a good
> solution to me.
>
> Best,
> Eelke
>
> 2011/8/9 "Jörn M. Horschig" <jm.horschig at donders.ru.nl>:
>> Hi Marco and Eelke,
>>
>> sampleinfo cannot be reconstructed after resampling the data, because there
>> is no way to precisely relate your resampled samples to the original
>> samples. My guess would be that you, Marco, did that and therefore encounter
>> the problem you mentioned. If that was so, I am not sure whether
>> fixsampleinfo should actually recompute the sampleinfo field, because it
>> makes absolutely no sense to have a sampleinfo field in your resampled data
>> that relates back samples in the original data.
>> Anyway, if you did not resample your data, then fixsampleinfo should work.
>> Could you let us know how you preprocessed your data?
>>
>> Best,
>> Jörn
>>
>> On 8/9/2011 11:00 AM, Eelke Spaak wrote:
>>>
>>> Hi Marco,
>>>
>>> The subfunction fixsampleinfo (used by ft_checkdata) attempts a number
>>> of things in order to create a sampleinfo field. My guess is that it
>>> detected a trial definition somewhere in your cfg "tree" (the data.cfg
>>> and data.cfg.previous fields) that was inconsistent with your data,
>>> and therefore refused to continue rebuilding a sampleinfo from
>>> scratch. I have now changed this function so that it will always
>>> reconstruct your sampleinfo, even if it detects an inconsistent trial
>>> definition in a previous configuration structure.
>>>
>>> So, it should now work :) At least, with tomorrow's update on the FTP
>>> server.
>>>
>>> Best,
>>> Eelke
>>>
>>> 2011/8/8 Marco Dahmane<marco.dahmane at gmail.com>:
>>>>
>>>> Hi Eelke,
>>>> So in order :)
>>>> 1) Fair enough. And I'm not using cfg.keeptrials='yes' anyway
>>>> 2) I'm actually using databrowser because I find it really convenient to
>>>> just remove and add channels, or see to which channel each line
>>>> corresponds.
>>>> I know I could do this using Matlab's plot, but I was just wondering why
>>>> it
>>>> wouldn't work with databrowser.
>>>> 3) Ok this is weird then. Something that will probably help you, whenever
>>>> I
>>>> use databrowser on my timelocked data, I get this :
>>>> Warning: the trial definition in the configuration is inconsistent with
>>>> the
>>>> actual data
>>>>>
>>>>> In utilities/private/warning_once at 75
>>>>
>>>>   In utilities/private/fixsampleinfo at 51
>>>>   In ft_checkdata at 579
>>>>   In ft_databrowser at 155
>>>> Warning: failed to create sampleinfo field
>>>>>
>>>>> In utilities/private/warning_once at 75
>>>>
>>>>   In utilities/private/fixsampleinfo at 83
>>>>   In ft_checkdata at 579
>>>>   In ft_databrowser at 155
>>>>  So there must be something wrong right?
>>>> And yes I'm using the latest FT...
>>>> Many thanks,
>>>> --Marco
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>>
>>
>> --
>> Jörn M. Horschig
>> PhD Student
>> Donders Institute for Brain, Cognition and Behaviour
>> Centre for Cognitive Neuroimaging
>> Radboud University Nijmegen
>> Neuronal Oscillations Group
>>
>> P.O. Box 9101
>> NL-6500 HB Nijmegen
>> The Netherlands
>>
>> Contact:
>> E-Mail: jm.horschig at donders.ru.nl
>> Tel:    +31-(0)24-36-68493
>> Web: http://www.ru.nl/donders
>>
>> Visiting address:
>> Trigon, room 2.30
>> Kapittelweg 29
>> NL-6525 EN Nijmegen
>> The Netherlands
>>
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>