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function [errorcode, varargout] = common_size (varargin)
% COMMON_SIZE Checks that all inputs are either scalar or of common size
% [ERR, Y1, ...] = common_size(X1, ...)
% Determine if all input arguments are either scalar or of common
% size. If so, ERR is zero, and YI is a matrix of the
% common size with all entries equal to XI if this is a scalar or
% XI otherwise. If the inputs cannot be brought to a common size,
% errorcode is 1, and YI is XI.
%
% Example:
% [errorcode, a, b] = common_size([1 2; 3 4], 5)
% >> errorcode = 0
% >> a = [ 1, 2; 3, 4 ]
% >> b = [ 5, 5; 5, 5 ]
% Adapted from GNU Octave 3.0.1
% Original file: general/common_size.m
% Original author: KH <Kurt.Hornik@wu-wien.ac.at>
% Copyright (C) 1995, 1996, 1999, 2000, 2002, 2004, 2005, 2007
% Kurt Hornik
% Copyright (C) 2008-2009 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)
error ('common_size: only makes sense if nargin >= 2');
end
len = 2;
for i = 1 : nargin
sz = size (varargin{i});
if (length (sz) < len)
s(i,:) = [sz, ones(1,len - length(sz))];
else
if (length (sz) > len)
if (i > 1)
s = [s, ones(size(s,1), length(sz) - len)];
end
len = length (sz);
end
s(i,:) = sz;
end
end
m = max (s);
if (any (any ((s ~= 1)') & any ((s ~= ones (nargin, 1) * m)')))
errorcode = 1;
varargout = varargin;
else
errorcode = 0;
for i = 1 : nargin
varargout{i} = varargin{i};
if (prod (s(i,:)) == 1)
varargout{i} = varargout{i} * ones (m);
end
end
end
end
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