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/usr/share/dynare/matlab/shiftS.m is in dynare-common 4.4.1-1build1.

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function S = shiftS(S,n)
%function S = shiftS(S)
%
% Removes the first element of a one dimensional cell array.

% Copyright (C) 2013 Dynare Team
%
% This file is part of Dynare.
%
% Dynare 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.
%
% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.

if nargin<2
    n = 1;
end
    
if length(S) > 1
    S = S(2:end);
    n = n-1;
else
    S = {};
    n = 0;
end

if n
    S = shiftS(S,n);
end