[FieldTrip] error when converting from spm to ft

[Zita Eva Patai]

Dear Jörn,

Thank you for the quick reply. I will try your suggestion!

Many thanks,
z

On Thu, Nov 15, 2012 at 2:55 PM, "Jörn M. Horschig" <
jm.horschig at donders.ru.nl> wrote:

>  Dear Zita,
>
> The function seems to convert the function not correctly to a freq
> datastructure - it seems more like raw data to me.
>
> freq data requires a .powspctrm field, which should be a matrix of
> observations x channels x freq x time. So you would need to use cell2mat on
> your .trial field. Probably you need to permute the dimensions to match
> this order. Additionally, you will need a .dimord field which which should
> be 'rpt_chan_freq_time' and you need a .freq field that contains the
> frequencies in that matrix. Please first make sure that your trials
> actually have 3 dimensions, else something else in the conversion went
> wrong.
>
> I don't use SPM so no clue if there is a better way than doing it manually.
>
> Best,
> Jörn
>
>
> On 11/14/2012 6:32 PM, Zita Eva Patai wrote:
>
> Hello FT-ers
>
>  In the past i had no problem when converting my data from SPM (where i
> do preprocessing and averaging) to FT (where I do my cluster-stats and
> plotting)
>
>  Currently, I am using the new way to convert (previous version seems
> outdated 'nspm2ftrip') and I am hitting a wall: it says my data is not in
> the right format, ie: not freq data. But i know that it is...any advice
> would be much appreciated! Not to mention is warns me my data is not
> epoched when it is indeed so...
>
>  Thank you!
> zita
>
>  *********************
>  *>> D = spm_eeg_load*
> SPM M/EEG data object
> Type: evoked
> Transform: TF
> 8 conditions
> 326 channels
> 20 frequencies
> 501 samples/trial
> 8 trials
> Sampling frequency: 250 Hz
> Loaded from file  C:\Users\Eva Z
> Patai\Documents\MATLAB\epoched_data\tf\rmtf_rs01_timecorr.mat
>
>  Use the syntax D(channels, frequencies, samples, trials) to access the
> data
> Type "methods('meeg')" for the list of methods performing other operations
> with the object
>  Type "help meeg/method_name" to get help about methods
>
>  *>> data = spm2ft(D)*
>
>  mapping condition label "11" to condition code 1
> mapping condition label "12" to condition code 2
> mapping condition label "21" to condition code 3
> mapping condition label "22" to condition code 4
> mapping condition label "31" to condition code 5
> mapping condition label "32" to condition code 6
> mapping condition label "41" to condition code 7
> mapping condition label "42" to condition code 8
>
>  data =
>
>        fsample: 250.0000
>          label: {326x1 cell}
>          time: {1x8 cell}
>         trial: {1x8 cell}
>     trialinfo: [8x1 double]
>           cfg: [1x1 struct]
>
>
>  *>> data2 = ft_checkdata(data, 'datatype', 'freq')*
>
> Warning: the data does not contain a trial definition, assuming that the
> trials are consecutive segments of a continuous recording
> > In utilities\private\warning_once at 81
>   In utilities\private\fixsampleinfo at 54
>   In ft_datatype_raw at 91
>   In ft_checkdata at 170
> Error using ft_checkdata (line 288)
> This function requires freq data as input.
>
>
>  --
>
>  Zita Patai
> DPhil, Experimental Psychology
> University of Oxford
> bcl.psy.ox.ac.uk/people/zita-eva-patai/
>
>
>
>
> _______________________________________________
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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
> FieldTrip Development Team
>
> P.O. Box 9101
> NL-6500 HB Nijmegen
> The Netherlands
>
> Contact:
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> Tel:    +31-(0)24-36-68493
> Web: http://www.ru.nl/donders
>
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>
>
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-- 

Zita Patai
DPhil, Experimental Psychology
University of Oxford
bcl.psy.ox.ac.uk/people/zita-eva-patai/
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