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Geant4/examples/advanced/dna/dsbandrepair/analysis/include/ODESolver.hh

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 26 //
 27 //
 28 /// \file ODESolver.hh
 29 /// \brief Definition of the ODESolver class
 30 
 31 #ifndef ODESolver_h
 32 #define ODESolver_h 1
 33 
 34 #include <vector>
 35 #include <map>
 36 #include <functional>
 37 
 38 
 39 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
 40 
 41 using myODEs = std::vector<double>(*)(double ,std::vector<double>) ;
 42 std::vector<double> operator*(const std::vector<double> v, double alfa);
 43 std::vector<double> operator+(const std::vector<double> v, double alfa);
 44 std::vector<double> operator+(const std::vector<double> v1, const std::vector<double> v2);
 45 
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
 47 
 48 class ODESolver
 49 {
 50 public:
 51     ODESolver();
 52     ~ODESolver() = default;
 53     void Embedded_RungeKutta_Fehlberg(  
 54         std::function<std::vector<double>(double,std::vector<double>)>, std::vector<double> &y,
 55         double start,double end,double stepsize=-1, double epsilon = 1e-3,
 56         std::vector<double> *time_observer=nullptr,std::vector<std::vector<double>> *state_observer=nullptr);
 57     void SetNstepsForObserver(unsigned int ndt) {fNstepsForObserver = ndt;}
 58     void RungeKutta4(  
 59         std::function<std::vector<double>(double,std::vector<double>)>, std::vector<double> &y,
 60         double start,double end,double stepsize=-1, 
 61         std::vector<double> *time_observer=nullptr,std::vector<std::vector<double>> *state_observer=nullptr);
 62 private:
 63     double RungeKutta_Fehlberg(std::function<std::vector<double>(double,std::vector<double>)>, 
 64             std::vector<double> &y,double t, double stepsize=-1);
 65     void absValuesVector(std::vector<double> &vIn);
 66     unsigned int fNstepsForObserver{1};
 67 };
 68 
 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
 70 
 71 inline void ODESolver::absValuesVector(std::vector<double> &vIn)
 72 {
 73     for (double &val : vIn) {
 74         if (val < 0) val *= -1.;
 75     }
 76 }
 77 
 78 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
 79 
 80 #endif