EulerIvpOdeSolver.cpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2009
00004 
00005 University of Oxford means the Chancellor, Masters and Scholars of the
00006 University of Oxford, having an administrative office at Wellington
00007 Square, Oxford OX1 2JD, UK.
00008 
00009 This file is part of Chaste.
00010 
00011 Chaste is free software: you can redistribute it and/or modify it
00012 under the terms of the GNU Lesser General Public License as published
00013 by the Free Software Foundation, either version 2.1 of the License, or
00014 (at your option) any later version.
00015 
00016 Chaste is distributed in the hope that it will be useful, but WITHOUT
00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00018 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00019 License for more details. The offer of Chaste under the terms of the
00020 License is subject to the License being interpreted in accordance with
00021 English Law and subject to any action against the University of Oxford
00022 being under the jurisdiction of the English Courts.
00023 
00024 You should have received a copy of the GNU Lesser General Public License
00025 along with Chaste. If not, see <http://www.gnu.org/licenses/>.
00026 
00027 */
00028 
00029 
00033 #include "EulerIvpOdeSolver.hpp"
00034 #include "AbstractIvpOdeSolver.hpp"
00035 #include "AbstractOdeSystem.hpp"
00036 #include "OdeSolution.hpp"
00037 
00038 //#include <iostream>
00039 #include <vector>
00040 
00054 void EulerIvpOdeSolver::CalculateNextYValue(AbstractOdeSystem* pAbstractOdeSystem,
00055                                             double timeStep,
00056                                             double time,
00057                                             std::vector<double>& currentYValues,
00058                                             std::vector<double>& nextYValues)
00059 {
00060     // for each timestep in AbstractOneStepIvpSolver calculates a vector containing
00061     // the next Y value from the current one for each equation in the system.
00062 
00063     const unsigned num_equations = pAbstractOdeSystem->GetNumberOfStateVariables();
00064 
00065     // Yes, this looks weird, but it makes good use of memory!
00066     pAbstractOdeSystem->EvaluateYDerivatives(time, currentYValues, nextYValues);
00067 
00068     for (unsigned i=0;i<num_equations; i++)
00069     {
00070         // nextYValues contains dY/dt until here
00071         nextYValues[i] = currentYValues[i] + timeStep*nextYValues[i];
00072     }
00073 }

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