[FieldTrip] Why does ft_selectdata remove "pow" from sourcedata during statistics?

[Andreas Sauer]

Dear Jan-Mathijs,

thanks for your reply!

In the meantime, another colleague also suggested to use a different syntax
and that worked! I still don't understand, why ft_selectdata removes the
"pow" field, but I can go on calculating my stats :-) .

Best wishes,

Andreas


2016-05-01 18:52 GMT+02:00 Schoffelen, J.M. (Jan Mathijs) <
jan.schoffelen at donders.ru.nl>:

> Dear Andreas,
>
> Have you tried it with a more recent version? Also, I would recommend not
> to use ft_sourcegrandaverage, but to use the syntax
> ft_sourcestatistics(cfg, source1{:}, source2{:}), assuming you have the
> single subject data represented in a cell-array of structures, with source1
> for condition 1 and source2 for condition 2.
>
> Best,
> Jan-Mathijs
>
>
>
>
> On 24 Apr 2016, at 18:36, Andreas Sauer <sauer.mpih at googlemail.com> wrote:
>
> Dear all,
>
> unfortunately, I am having problems to run source statistics on ERF
> mismatch negativity data (recorded with a 4D system).
>
> With the following data structure as input (output from
> ft_sourcegrandaverage), fieldtrip gives a warning that it „could not
> determine dimord of „pow“ in the following data“
>
> pow: [16x37696 double]
> dim: [31 38 32]
> inside: [37696x1 logical]
> pos: [37696x3 double]
> time: [1x900 double]
> cfg: [1x1 struct]
>
> and later throws an error that „field „pow“ (is) not present in data“. I
> checked the ft_sourcestatistic script step by step and found out that
> ft_selectdata removes it after being called by ft_sourcestatistics.
>
> I am using the fieldtrip version from 15/05/2015. I also tried with older
> versions, one from late 2014 and late 2013, but nothing worked.
>
> Unfortunately, since ft_selectdata removes the field "pow" from the data
> during the call to ft_sourcestatistic, I can’t put it back in to the
> structure.
>
> Any help with this (esp. why „pow“ is being removed) is highly appreciated!
>
> Thanks and best wishes,
>
> Andreas
>
>
>
> --
> Dipl.-Psych. Andreas Sauer
> Max Planck Institute for Brain Research
> Deutschordenstraße 46
> 60528 Frankfurt am Main
> Germany
>
> T: +49 69 96769 278
> F: +49 69 96769 327
> Email: sauer.mpih at gmail.com
> www.brain.mpg.de
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-- 
Dipl.-Psych. Andreas Sauer
Max Planck Institute for Brain Research
Deutschordenstraße 46
60528 Frankfurt am Main
Germany

T: +49 69 96769 278
F: +49 69 96769 327
Email: sauer.mpih at gmail.com
www.brain.mpg.de
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