mergeconfig.m
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	function input = mergeconfig(input, default)

	% MERGECONFIG merges the fields of a default structure into an input
	% configuration structure
	%
	% Use as
	% output = mergeconfig(input, default)

	% Copyright (C) 2009-2012, Robert Oostenveld
	%
	% $Id: mergeconfig.m 7123 2012-12-06 21:21:38Z roboos $

	if isempty(input) && ~isstruct(input)
	% ensure that it is an empty struct, not an empty double
	input = struct;
	end

	if isempty(default) && ~isstruct(default)
	% ensure that it is an empty struct, not an empty double
	default = struct;
	end

	% merge the input with the fields from default
	fieldsused = fieldnames(default);
	for i=1:length(fieldsused)
	fn = fieldsused{i};

	if ~isfield(input, fn) && ~isstruct(default.(fn))
	% simply copy the value over
	input.(fn) = default.(fn);
	elseif ~isfield(input, fn) && isstruct(default.(fn))
	% simply copy the substructure over
	input.(fn) = default.(fn);
	elseif isfield(input, fn) && ~isstruct(default.(fn))
	% do not copy it over, keep the original value
	elseif isfield(input, fn) && isstruct(default.(fn))
	% merge the two substructures
	input.(fn) = mergeconfig(input.(fn), default.(fn));
	end

	end % for all fields