[Mne_analysis] mne epochs to fieldtrip

[Elena Orekhova]

I did. Hopefully it worked.
I add the text here in case it did not.

Elena

Hello,
CC @robertoostenveld <https://github.com/robertoostenveld>, @agramfort
<https://github.com/agramfort>

This seems to be MNE-Fieldtrip format compatibility issue.

I tried to import -epo.fif file created in MNE python, latest version on
today (v13) using fieldtrip cookbook:

%%%%%%%%%%%%%%%%%%%%%%%
fiff_file = '/MYPATH/myfile-epo.fif';
cfg = []
cfg.dataset = fiff_file;
data1 = ft_preprocessing(cfg);
%%%%%%%%%%%%%%%%%%%%%%%

I got en error:
Reference to non-existent field 'FIFFB_EPOCHS'.

Error using fiff_read_epochs (line 46)
Could not find epochs data

Error in fiff_read_epochs (line 46)
error(me,'Could not find epochs data');

Error in ft_read_header (line 1665)
epochs = fiff_read_epochs(filename);

Error in ft_preprocessing (line 397)
hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat,
'coordsys', cfg.coordsys, 'coilaccuracy', cfg.coilaccuracy);

I use the latest Fieldtrip version fieldtrip-lite-20161024. It seems that
something is wrong with the data structure...?

Elena Orekhova

On 25 October 2016 at 12:02, Robert Oostenveld <
robert.oostenveld at donders.ru.nl> wrote:

> Hi Elena
>
> I suspect it to be an error in the MNE Matlab code, as FieldTrip itself
> does not use the FIFFB_EPOCHS field.
>
> mac011> cd /Users/roboos/matlab/fieldtrip/fileio/
> mac011> grep FIFFB_EPOCHS *.m
> mac011> grep FIFFB_EPOCHS private/*.m
> [both empty]
>
> mac011> cd /Users/roboos/matlab/fieldtrip/external/mne
> mac011> grep FIFFB_EPOCHS *.m
> fiff_define_constants.m:FIFF.FIFFB_EPOCHS             = 122;
> fiff_read_epochs.m:ep = fiff_dir_tree_find(meas, FIFF.FIFFB_EPOCHS);
>
> Could you follow this up by posting the detailled error message on
> https://github.com/mne-tools/mne-matlab, i.e. create an issue there on
> github and post details of the error message? Please do mention
> @robertoostenveld and @agramfort in the issue, then we’ll both get notified.
>
> Oh, and prior to that: could you check that you are using the latest
> version of the mne-matlab toolbox? One version is included in
> fieldtrip/external/mne, but that might not be the latest one, and it might
> also not be the one you are actually using.
>
> Robert
>
>
>
>
> On 25 Oct 2016, at 10:01, Alexandre Gramfort <alexandre.gramfort at telecom-
> paristech.fr> wrote:
>
> hi Elena,
>
> we don't maintain the fieldtrip reader for mne files just the
> mne-matlab toolbox.
>
> you should post an issue on the fieldtrip github page.
>
> maybe we can help but we'll need enough info to replicate the bug.
>
> Alex
>
>
> On Mon, Oct 24, 2016 at 6:17 PM, Elena Orekhova
> <orekhova.elena.v at gmail.com> wrote:
>
> Hello,
>
> I try to import mne epochs file in fieldtrip.
> fiff_file = 'ttt-epo.fif');
> cfg = [];
> cfg.dataset = fiff_file;
> data1 = ft_preprocessing(cfg);
>
> It worked before, but with the current versions of MNE/fieldtrip I get an
> error:
> Reference to non-existent field 'FIFFB_EPOCHS'.
>
> Could somebody help to fix this problem?
>
> Elena
>
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