#include <ConstantStepOdeSolver.h>

Inheritance diagram for RK2:

Public Member Functions
const char *	methodName () const override

	RK2 ()

	RK2 (const AbsODERHS &rhs)

Public Member Functions inherited from ConstantStepOdeSolver
	ConstantStepOdeSolver ()

	ConstantStepOdeSolver (const AbsODERHS &rhs)

	ConstantStepOdeSolver (const ConstantStepOdeSolver &r)

double	getCoordinate (const unsigned which, const unsigned idx) const

double	getIntegrated (unsigned which, unsigned idx) const

double	getPeakTime (unsigned which) const

AbsODERHS *	getRHS ()

const AbsODERHS *	getRHS () const

double	getTime (const unsigned idx) const

double	interpolateCoordinate (unsigned which, double t, bool cubic=false) const

double	interpolateIntegrated (unsigned which, double t, bool cubic=false) const

double	lastDeltaT () const

unsigned	lastDim () const

double	lastMaxT () const

unsigned	lastRunLength () const

ConstantStepOdeSolver &	operator= (const ConstantStepOdeSolver &r)

void	run (const double *initialConditions, unsigned lenConditions, double dt, unsigned nSteps)

void	setHistory (double dt, const double *data, unsigned dim, unsigned runLen)

void	setRHS (const AbsODERHS &rhs)

void	truncateCoordinate (unsigned which, double minValue, double maxValue)

void	writeHistory (std::ostream &os, double dt, bool cubic=false) const

void	writeIntegrated (std::ostream &os, unsigned which, double dt, bool cubic=false) const

virtual	~ConstantStepOdeSolver ()

Private Member Functions
void	step (double t, double dt, const double x, unsigned lenX, double coordIncrement) const override

Private Attributes
std::vector< double >	buf_

Additional Inherited Members
Protected Attributes inherited from ConstantStepOdeSolver
AbsODERHS *	rhs_

Detailed Description

Definition at line 127 of file ConstantStepOdeSolver.h.

Constructor & Destructor Documentation

◆ RK2() [1/2]

RK2::RK2 ( )

inline

Definition at line 129 of file ConstantStepOdeSolver.h.

129 : ConstantStepOdeSolver() {}

◆ RK2() [2/2]

RK2::RK2 ( const AbsODERHS & rhs )

inlineexplicit

Definition at line 131 of file ConstantStepOdeSolver.h.

131 : ConstantStepOdeSolver(rhs) {}

Member Function Documentation

◆ methodName()

const char* RK2::methodName ( ) const

inlineoverridevirtual

Implements ConstantStepOdeSolver.

Definition at line 133 of file ConstantStepOdeSolver.h.

133 { return "2nd order Runge-Kutta"; }

◆ step()

void RK2::step	(	double	t,
		double	dt,
		const double *	x,
		unsigned	lenX,
		double *	coordIncrement
	)		const

overrideprivatevirtual

Implements ConstantStepOdeSolver.

Definition at line 299 of file ConstantStepOdeSolver.cc.

                                                                                                                   {
   const double halfstep = dt / 2.0;
   if (buf_.size() < lenX)
     buf_.resize(lenX);
   double* midpoint = &buf_[0];
   rhs_->calc(t, x, lenX, midpoint);
   for (unsigned i = 0; i < lenX; ++i) {
     midpoint[i] *= halfstep;
     midpoint[i] += x[i];
   }
   rhs_->calc(t + halfstep, midpoint, lenX, coordIncrement);
   for (unsigned i = 0; i < lenX; ++i)
     coordIncrement[i] *= dt;
 }

References buf_, AbsODERHS::calc(), dt, mps_fire::i, ConstantStepOdeSolver::rhs_, OrderedSet::t, and x.

Member Data Documentation

◆ buf_

std::vector<double> RK2::buf_

mutableprivate

Definition at line 138 of file ConstantStepOdeSolver.h.

Referenced by step().

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members