[FieldTrip] Issues with ft_combineplanar(cfg, data)

Eelke Spaak eelke.spaak at donders.ru.nl
Tue Apr 9 11:50:21 CEST 2013

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
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