[FieldTrip] How to use FieldTrip on mat files for Biomag2012?

Eelke Spaak eelke.spaak at donders.ru.nl
Mon Jun 11 09:27:28 CEST 2012

Hi Vlad,

If you have the data already in Matlab, it is quite straightforward to
convert it to a FieldTrip-compatible data structure. See
for an explanation of how raw data structures look, in general.

Now I see Jörn's e-mail on the same subject. His explanation is the
right one, if the data you have is already in FieldTrip format.
However, from your explanation, I assume you still need to do a little
bit of tweaking to get your data to be FT-compatible.

Hope this helps,

On 11 June 2012 03:40, Vlad Chiriacescu <vlad_chiriacescu at yahoo.com> wrote:
>   Hello,
>   I am working on a school project related to the Biomag 2012 analysis
> competition.
>   I have downloaded a .zip file from ftp://ftp.fcdonders.nl/pub/biomag2012/.
>   I have extracted the content and I am interested in the second objective,
> the one related to long-term memory representations (folder data2).
>   I was able to load the 2 mat files into Matlab workspace.
>   I was also able to use FieldTrip functions on tutorial code.
>   However, when I try to use ft_preprocessing on one of the mat files I get
> an error.
>   Here is the code I wrote:
>   cfg1.dataset = 'ltmcla_S08.mat'
>   data_org = ft_preprocessing(cfg1)
>   And the error is:
>   ??? Error using ==> ft_read_header at 1639
> unsupported header format (matlab)
> Error in ==> ft_preprocessing at 344
>   hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat);
>   I saw a tutorial using ft_read_header, ft_read_data and ft_write_data
> on a .dat file that was converting it to a mat/bin pair.
>   However, I do not have a .dat file, I have a .mat file.
>   Just in case is necessary, I write some details of the .mat file:
> Is a 1*1 matlab structure with the following fields:
> data, channel, design, time, fs, dim.
>   How could I use FieldTrip on this data? If there are more ways, which one
> would be the fastest/easiest?
>   Thanks a lot,
>   Vlad
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