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function initialAssignment = Model_getInitialAssignmentBySymbol(SBMLModel, symbol)
% initialAssignment = Model_getInitialAssignmentBySymbol(SBMLModel, symbol)
%
% Takes
%
% 1. SBMLModel, an SBML Model structure
% 2. symbol; a string representing the symbol of SBML InitialAssignment structure
%
% Returns
%
% 1. the SBML InitialAssignment structure that has this symbol
%
%<!---------------------------------------------------------------------------
% This file is part of SBMLToolbox. Please visit http://sbml.org for more
% information about SBML, and the latest version of SBMLToolbox.
%
% Copyright (C) 2009-2012 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. EMBL European Bioinformatics Institute (EBML-EBI), Hinxton, UK
%
% Copyright (C) 2006-2008 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. University of Hertfordshire, Hatfield, UK
%
% Copyright (C) 2003-2005 jointly by the following organizations:
% 1. California Institute of Technology, Pasadena, CA, USA
% 2. Japan Science and Technology Agency, Japan
% 3. University of Hertfordshire, Hatfield, UK
%
% SBMLToolbox is free software; you can redistribute it and/or modify it
% under the terms of the GNU Lesser General Public License as published by
% the Free Software Foundation. A copy of the license agreement is provided
% in the file named "LICENSE.txt" included with this software distribution.
%----------------------------------------------------------------------- -->
% check that input is correct
if (~isValidSBML_Model(SBMLModel))
error(sprintf('%s\n%s', 'Model_getInitialAssignmentBySymbol(SBMLModel, symbol)', 'first argument must be an SBML model structure'));
elseif (~ischar(symbol))
error(sprintf('%s\n%s', 'Model_getInitialAssignmentBySymbol(SBMLModel, symbol)', 'second argument must be a string'));
elseif ((SBMLModel.SBML_level == 2 && SBMLModel.SBML_version == 1) ...
|| SBMLModel.SBML_level == 1)
error(sprintf('%s\n%s', 'Model_getInitialAssignmentBySymbol(SBMLModel, symbol)', ...
'no symbol field in a level 1 or l2v1 model'));
end;
initialAssignment = [];
for i = 1:length(SBMLModel.initialAssignment)
if (strcmp(symbol, SBMLModel.initialAssignment(i).symbol))
initialAssignment = SBMLModel.initialAssignment(i);
break;
end;
end;
%if level and version fields are not on returned object add them
if ~isempty(initialAssignment) && ~isfield(initialAssignment, 'level')
initialAssignment.level = SBMLModel.SBML_level;
initialAssignment.version = SBMLModel.SBML_version;
end;
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