RKOne4OrderStep< T, N > Class Template Reference

#include <RKOne4OrderStep.h>

Public Types
typedef T	Scalar
typedef RKSmallVector< T, N >	Vector

Public Member Functions
std::pair< Vector, T >	operator() (Scalar startPar, const Vector &startState, const RKDerivative< T, N > &deriv, const RKDistance< T, N > &dist, Scalar step)

Detailed Description

template<typename T, int N>
class RKOne4OrderStep< T, N >

Definition at line 11 of file RKOne4OrderStep.h.

Member Typedef Documentation

Scalar

template<typename T , int N>

typedef T RKOne4OrderStep< T, N >::Scalar

Definition at line 13 of file RKOne4OrderStep.h.

Vector

template<typename T , int N>

typedef RKSmallVector<T, N> RKOne4OrderStep< T, N >::Vector

Definition at line 14 of file RKOne4OrderStep.h.

Member Function Documentation

operator()()

template<typename T , int N>

std::pair<Vector, T> RKOne4OrderStep< T, N >::operator() ( Scalar  startPar, const Vector &  startState, const RKDerivative< T, N > &  deriv, const RKDistance< T, N > &  dist, Scalar  step  )

inline

Definition at line 16 of file RKOne4OrderStep.h.

References funct::abs(), change_name::diff, and SiPixelPI::one.

                                               {
    const Scalar huge = 1.e5;  // ad hoc protection against infinities, must be done better!
    const Scalar hugediff = 100.;

    RK4OneStepTempl<T, N> solver;
    Vector one(solver(startPar, startState, deriv, step));
    if (std::abs(one[0]) > huge || std::abs(one(1)) > huge)
      return std::pair<Vector, Scalar>(one, hugediff);

    Vector firstHalf(solver(startPar, startState, deriv, step / 2));
    Vector secondHalf(solver(startPar + step / 2, firstHalf, deriv, step / 2));
    Scalar diff = dist(one, secondHalf, startPar + step);
    return std::pair<Vector, Scalar>(secondHalf, diff);
  }