function [a,b] = align(a, b) % --*-- Unitary tests --*--
%@info:
%! @deftypefn {Function File} {[@var{a}, @var{b}] =} align (@var{a}, @var{b})
%! @anchor{dseries/align}
%! @sp 1
%! If dseries objects @var{a} and @var{b} are defined on different time ranges, extend @var{a} and/or
%! @var{b} with NaNs so that they are defined on the same time range.
%! @sp 2
%! @strong{Inputs}
%! @sp 1
%! @table @ @var
%! @item a
%! Object instantiated by @ref{dseries}.
%! @item b
%! Object instantiated by @ref{dseries}.
%! @end table
%! @sp 2
%! @strong{Outputs}
%! @sp 1
%! @table @ @var
%! @item a
%! Object instantiated by @ref{dseries}.
%! @item b
%! Object instantiated by @ref{dseries}.
%! @end table
%! @end deftypefn
%@eod:
% 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 .
if ~isequal(frequency(a),frequency(b))
error(['dseries::align: ''' inputname(1) ''' and ''' inputname(2) ''' dseries objects must have common frequencies!'])
end
init = min(firstdate(a),firstdate(b));
last = max(lastdate(a),lastdate(b));
if isempty(intersect(a.dates,b.dates))
error(['dseries::align: ''' inputname(1) ''' and ''' inputname(2) ''' dseries object must have at least one common date!'])
end
a_init = init;
b_init = init;
a_last = last;
b_last = last;
if firstdate(b)>init
n = firstdate(b)-init;
b.data = [NaN(n,b.vobs); b.data];
b.nobs = b.nobs+n;
b_init = init;
end
if firstdate(a)>init
n = firstdate(a)-init;
a.data = [NaN(n,a.vobs); a.data];
a.nobs = a.nobs+n;
a_init = init;
end
if lastdate(b)