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function y = istrue(x)
% ISTRUE ensures that a true/false input argument like "yes", "true"
% or "on" is converted into a boolean
% Copyright (C) 2009-2012, Robert Oostenveld
%
% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org
% for the documentation and details.
%
% FieldTrip is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% FieldTrip is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.
%
% $Id$
true_list = {'yes' 'true' 'on' 'y' };
false_list = {'no' 'false' 'off' 'n' 'none'};
if ischar(x)
% convert string to boolean value
if any(strcmpi(x, true_list))
y = true;
elseif any(strcmpi(x, false_list))
y = false;
else
error('cannot determine whether "%s" should be interpreted as true or false', x);
end
else
% convert numerical value to boolean
y = logical(x);
end
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