forming one datset from multiple data files

[Ingrid Nieuwenhuis]

Hi Dan,



I think ft_appenddata is what you need. This is the help of the function:



% FT_APPENDDATA combines multiple datasets that have been preprocessed
separately

% into a single large dataset.

%

% Use as

%   data = ft_appenddata(cfg, data1, data2, data3, ...)

% where the configuration can be empty.

%

% If the input datasets all have the same channels, the trials will be

% concatenated. This is useful for example if you have different

% experimental conditions, which, besides analyzing them separately, for

% some reason you also want to analyze together. The function will check

% for consistency in the order of the channels. If the order is inconsistent

% the channel order of the output will be according to the channel order of

% the first data structure in the input.

%

% If the input datasets have different channels, but the same number of

% trials, the channels will be concatenated within each trial. This is

% useful for example if the data that you want to analyze contains both

% MEG and EMG channels which require different preprocessing options.

%

% Occasionally, the data needs to be concatenated in the trial dimension
while

% there's a slight discrepancy in the channels in the input data (e.g.
missing

% channels in one of the data structures). The function will then return a
data

% structure containing only the channels which are present in all inputs.

% See also FT_PREPROCESSING



Good luck,

Ingrid



------------------------------------

Ingrid L.C. Nieuwenhuis

PhD student

Donders Institute for Brain, Cognition and Behaviour,

Centre for Cognitive Neuroimaging

Radboud University Nijmegen, The Netherlands

Email: ingrid.nieuwenhuis at donders.ru.nl

Tel: 0031 (0)24 - 36 10887

  _____

From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Dan Zhang
Sent: Tuesday, April 06, 2010 10:13 AM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] forming one datset from multiple data files



Hi,

Recently I started to use FieldTrip for my EEG analysis. In my experiment,
there were several sessions per condition saved in separate data files. I
would like to put them all into one dataset.

I went through the tutorial but it seemed all the operations assumed we had
one data file per condition. Is there any way to form one dataset from two
or more data files? I know I can do it manually, just wanna know if there is
a function already in the toolbox.

Thanks & best regards,
Dan Zhang


----------------------------------

The aim of this list is to facilitate the discussion between users of the
FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and
EEG analysis.

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http://www.ru.nl/fcdonders/fieldtrip/


----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
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