spm2fieldtrip.m
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	function data = spm2fieldtrip(D)

	% SPM2FIELDTRIP converts an SPM8 meeg object into a FieldTrip raw data structure
	%
	% Use as
	% data = spm2fieldtrip(D)
	% where D is the SPM meeg object which you can load in with SPM_EEG_LOAD
	% and where data is a FieldTrip raw data structure as if it were returned
	% by FT_PREPROCESSING.
	%
	% See also FT_PREPROCESSING, SPM_EEG_LOAD

	if ~ft_hastoolbox('spm8up')
	% it should be version spm8 or higher, since spm99, spm2 and spm5 did not yet the "meeg" object
	ft_error('this requires SPM8 or later to be on your MATLAB path');
	end

	if ~isa(D, 'meeg')
	ft_error('this requires an SPM "meeg" object as input')
	end

	% this is how SPM8 represents it
	data = D.ftraw(0);

	clist = D.condlist;
	conditions = D.conditions;

	data.trialinfo = zeros(D.ntrials,1);
	for k = 1:numel(clist)
	fprintf('mapping condition label "%s" to condition code %d\n', clist{k}, k);
	sel=strcmp(clist{k}, conditions);
	data.trialinfo(sel) = k;
	end

	% FIXME the following is not correct
	%
	% data.sampleinfo = zeros(ntrials,2);
	% for i=1:ntrials
	% data.sampleinfo(i,1) = D.indsample(i);
	% data.sampleinfo(i,2) = D.indsample(i) + D.nsamples;
	% end