% Y = VEC(x) Given an m x n matrix x, this produces the vector Y of length
% m*n that contains the columns of the matrix x, stacked below each other.
%
% SEE ALSO mat.
function x = vec(X)
%
% This file is part of SeDuMi 1.02 (03AUG1998)
% Copyright (C) 1998 Jos F. Sturm
% CRL, McMaster University, Canada.
% Supported by the Netherlands Organization for Scientific Research (NWO).
%
% This program 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 2 of the License, or
% (at your option) any later version.
%
% This program 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 this program; if not, write to the Free Software
% Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
%
[m n] = size(X);
x = zeros(m*n,1);
x(:) = X;