[FieldTrip] reading in and preprocessing gtec_mat data

[Stephen Whitmarsh]

Hi Louisa et al,

It seems that you are actually not trying to read data in the Gtec data
format, but that of simulink (which was saved as a mat file, as a matlab
file).
So, you should be able to just read your mat file and then put your data in
a fieldtrip data structure.

See: http://www.fieldtriptoolbox.org/faq/how_can_i_import_my_own_dataformat

Cheers,
Stephen










On 27 September 2017 at 22:01, Louisa Bogaerts <bog.louisa at gmail.com> wrote:

> Hello everyone,
>
>
>
> In the lab or Dr. Landau we recently started using a *g.tech EEG setup*
> and *Simulink* record the data. We used the newest version of Fieldtrip
> to try analyze the data.
>
>
>
> Simulink outputs the data as a .mat file (an example here:
> https://www.dropbox.com/s/6xgio9w81qx94bq/example.mat?dl=0), and
> according to the fieldtrip documentation this data format should now be
> supported: e.g., https://github.com/fieldtrip/f
> ieldtrip/blob/master/fileio/ft_read_data.m, lines 274-276:
>
> if any(strcmp(dataformat, {'bci2000_dat', 'eyelink_asc', 'gtec_mat',
>
> 'gtec_hdf5', 'mega_neurone'}))
>
>
>
> However, it seems that multiple Fieldtrip functions are “looking” for a
> header file that is not found.
>
> -   When reading in the data with ft_read_data() we get the following
> error messages (whereas simply loading them with load() works fine):
>
> Error using ft_notification (line 340)
>
> unsupported header format "matlab"
>
>
>
> Error in ft_error (line 39)
>
>   ft_notification(varargin{:});
>
>
>
> Error in ft_read_header (line 2325)
>
>         ft_error('unsupported header format "%s"', headerformat);
>
>
>
> Error in ft_read_data (line 200)
>
>   hdr = ft_read_header(filename, 'headerformat', headerformat, 'chanindx',
>
>   chanindx, 'checkmaxfilter', checkmaxfilter);
>
>
>
> - The same error messages show when using ft_preprocessing().
>
>
>
> Does anyone have experience reading in and preprocessing gtech_mat data
> and can he/she help us understand how to save the header info so that
> fieldtrip can read it and recognise the data as gtec_mat?
>
>
>
> Any help will be very much appreciated.
>
>
>
> Louisa, Omri & Flor
>
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>
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