IsToolboxPresent (TBName)

%Function IsToolboxPresent
%
%IsToolboxPresent checks whether a certain toolbox is present on your
%system.
%
%Syntax:
%    res = IsToolboxPresent (TBName);
%
%Input parameters:
%    TBName: name of the toolbox
%
%Output parameters:
%    res: boolean, is equal to true if the toolbox is present, if not res
%        is false
%
%Example:
%    IsToolboxPresent ('PLS_toolbox')
%    IsToolboxPresent ('Symbolic Math Toolbox')
%    IsToolboxPresent ('Symbolic')

%The Biodata toolbox for MATLAB: a spectral database system for storing and
%processing spectra
%C 2008, Kris De Gussem, Raman Spectroscopy Research Group, Department
%of analytical chemistry, Ghent University
%C 2009 Kris De Gussem
%
%This file is part of Biodata.
%
%Biodata 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.
%
%Biodata 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 Biodata.  If not, see <http://www.gnu.org/licenses/>.

%Copyright (c) 2008-2009, 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 
%CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
%SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
%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 res = IsToolboxPresent (TBName)
varName = ['ToolboxPresent' TBName];
eval ([ 'global ' varName]);
eval (['tmp = isempty (' varName ');' ]);
res=0;
if tmp %#ok<NODEF> value comes from the eval command
    TBS = ver;
    le=length(TBName);
    for i=1:length(TBS)
        tmp = TBS(i).Name;
        if strncmpi(TBName, tmp, min(le,length(tmp)) )==1 %only use first n characters to prevent that a toolbox is not recognisedbecause additional strings are present (e.g. 'toolbox')
            res=1;
            eval( [varName ' = res;']);
            eval ( ['clear ' varName]);
            return;
        end
    end
else
    eval ([ 'res = ' varName ';']);
    eval ( ['clear ' varName]);
end

eval( [varName ' = res;']);
eval ( ['clear ' varName]);