MakeVector (V, msg)

%function V = MakeVector (X, msg)
%
%MakeVector will check for an input matrix X: if it's a vector, and if not
%it will display a user supplied error message msg. MakeVector will return
%the input matrix as a column vector.
%
%Example:
%   V = MakeVector (X);
%   V = MakeVector (X, 'Input matrix X is not a parameter, but a multidimensional matrix...');

%This software package is dual licensed. You can use it according to the term
%of either the GPLv3 or the BSD license.
%
%C 2003-2008, Kris De Gussem, Raman Spectroscopy Research Group, Department
%of analytical chemistry, Ghent University
%C2009 Kris De Gussem
%
%This file is part of GSTools.
%
%GSTools 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.
%
%GSTools 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 GSTools.  If not, see <http://www.gnu.org/licenses/>.

%Copyright (c) 2003-2009, Kris De Gussem
%All rights reserved.
%
%Redistribution and use in source and binary forms, with or without 
%modification, are permitted provided that the following conditions are 
%met:
%
%    * Redistributions of source code must retain the above copyright 
%      notice, this list of conditions and the following disclaimer.
%    * Redistributions in binary form must reproduce the above copyright 
%      notice, this list of conditions and the following disclaimer in 
%      the documentation and/or other materials provided with the distribution
%    * Neither the name of Raman Spectroscopy Research Group, Department of
%	  analytical chemistry, Ghent University nor the names 
%      of its contributors may be used to endorse or promote products derived 
%      from this software without specific prior written permission.
%      
%THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
%AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
%IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
%ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
%LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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%INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
%CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
%ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
%POSSIBILITY OF SUCH DAMAGE.


function V2 = MakeVector (V, msg)
switch nargin
    case 1
        msg = 'A Vector is needed, but could not transform the input to a vector.';
    case 2
    otherwise
        error ('Wrong number of input arguments');
end

t=size(V);
if length(t) > 2
    disp (['The number of dimensions is:' length(t)]);
    error ('The number of dimensions is to big. A twodimensional array must be given...');
end

V2 = V(:); % make a column vector out of V
if (prod(t)) ~= (sum(t)-1)
    error (msg);
end