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function [a,b] = ffill(x,ixc,y)
% function [a,b] = ffill(x,ixc,y)
% Makes the horizontal concatenation if x exists
% and fills the matrix with 0 if x and y are not the same size.
%
% INPUTS
% x: matrix
% ixc: vector of indices
% y: matrix
%
% OUTPUTS
% a: concatenation results
% b: vector
%
% SPECIAL REQUIREMENTS
% none
% Copyright (C) 2001-2017 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 <https://www.gnu.org/licenses/>.
xc = size(x,1) ;
if isempty(y)
b = [ixc; 0];
a = [x zeros(size(x,1),1)];
else
yc = size(y,1) ;
b = [ixc;yc] ;
if xc > yc
a = [x [y;zeros(xc-yc,size(y,2))]] ;
elseif yc > xc
a = [[x;zeros(yc-xc,size(x,2))] y] ;
else
a = [x y] ;
end
end
% 2001/09/1 MJ corrected for absent lags
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