function vs = chain(ts,us) % --*-- Unitary tests --*--
% Copyright (C) 2014 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 .
if vobs(ts)-vobs(us)
error(['dseries::chain: dseries objects ' inputname(1) ' and ' inputname(2) ' must have the same number of variables!'])
end
if frequency(ts)-frequency(us)
error(['dseries::chain: dseries objects ' inputname(1) ' and ' inputname(2) ' must have common frequencies!'])
end
if lastdate(ts)