[FieldTrip] databrowser and merged data

["Jörn M. Horschig"]

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

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