Nash2004ContractionModel.hpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2011
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 #ifndef NASH2004CONTRACTIONMODEL_HPP_
00030 #define NASH2004CONTRACTIONMODEL_HPP_
00031 
00032 #include "AbstractOdeBasedContractionModel.hpp"
00033 #include "OdeSystemInformation.hpp"
00034 #include "Exception.hpp"
00035 
00053 class Nash2004ContractionModel : public AbstractOdeBasedContractionModel
00054 {
00056     static const double kTa;
00057 
00059     static const double e0ByT0;
00060 
00062     double mScaledVoltage;
00063 
00064 public:
00066     Nash2004ContractionModel() : AbstractOdeBasedContractionModel(1)
00067     {
00068         this->mpSystemInfo = OdeSystemInformation<Nash2004ContractionModel>::Instance();
00069 
00070         mScaledVoltage = 0.0;
00071         this->mStateVariables.push_back(0.0);
00072     }
00073 
00080     void EvaluateYDerivatives(double time, const std::vector<double>& rY, std::vector<double>& rDY)
00081     {
00082         double epsilon = (mScaledVoltage < 0.05 ? e0ByT0 : 10*e0ByT0);
00083         rDY[0] = epsilon * (kTa*mScaledVoltage - rY[0]);
00084     }
00085 
00090     void SetInputParameters(ContractionModelInputParameters& rInputParameters)
00091     {
00092         assert(rInputParameters.voltage != DOUBLE_UNSET);
00093         mScaledVoltage = (rInputParameters.voltage+85)/125;
00094     }
00095 
00101     void SetStretchAndStretchRate(double stretch, double stretchRate)
00102     {
00103     }
00104 
00108     double GetActiveTension()
00109     {
00110         return rGetStateVariables()[0];
00111     }
00112 
00117     double GetNextActiveTension()
00118     {
00119         return mTemporaryStateVariables[0];
00120     }
00121 
00122 
00126     bool IsStretchDependent()
00127     {
00128         return false;
00129     }
00130 
00134     bool IsStretchRateDependent()
00135     {
00136         return false;
00137     }
00138 };
00139 
00140 
00141 
00142 #endif /*NASH2004CONTRACTIONMODEL_HPP_*/

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