[FieldTrip] Issues with ft_combineplanar(cfg, data)

Niccolò Pescetelli niccol000 at yahoo.it
Tue Apr 9 16:45:56 CEST 2013

Thank you Eelke.

I found out that the problem was before calling the combine planar function. 
The original script read in 5 files of raw data (which I could not upload in dropbox, due to dimensions issues). These have the .grad field, but when I appenddata() the data structure looses its grad field.

I managed to artificially attach it again, but I don't understand why the function ft_appenddata() does this
Any idea? 

I will try to send you the files in a way or the other



 Da: Eelke Spaak <eelke.spaak at donders.ru.nl>
A: FieldTrip discussion list <fieldtrip at science.ru.nl> 
Inviato: Martedì 9 Aprile 2013 11:50
Oggetto: Re: [FieldTrip] Issues with ft_combineplanar(cfg, data)
Dear Nic,

That is very weird. The fact that a grad seems to be created out of
thin air by ft_combineplanar suggests to me that there might be an
error in your script. (However, of course it could also be a bug in
fieldtrip.) Could you perhaps send a functional (small) piece of data,
along with a script, that reproduces the error? Your e-mail currently
does not have enough information to judge what's truly going on. If
your data is >1MB, please use one of the file sharing services listed
here: http://fieldtrip.fcdonders.nl/faq/how_should_i_send_example_data_to_the_developers


On 9 April 2013 10:33, Niccolò Pescetelli <niccol000 at yahoo.it> wrote:
> Dear all,
> I am new to fieldtrip and I would like to have your opinion about a bizarre
> error that I find trying to execute the function ft_combineplanar(). What am
> I trying to do is to  obtain the planar gradient from raw data. I use a
> neuromag306 Elekta MEG system.
> I tried to dig deeper into the scripts and I notice some quirks the error
> could derive from:
> 1. as soon as I call ft_combineplanar(cfg, data) , data.trials switches from
> 840 trials to 192 trials, without any command being provided that is BEFORE
> the first line of ft_combineplanar(cfg, data) being executed! At the same
> time all data.trials becomes empty arrays
> 2. my data structure does not contain the fields 'grad' before
> ft_combineplanar(cfg, data) has been called but it does afterwards . Again
> this happen without any command having been given
> 3. The error finally occurs in line 210 of the ft_combineplanar function
> (indexing error) and it's due to the data.trial array being empty
> What do you think?
> Best
> Nic
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

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