H4::TimeStep4th Class Reference

#include <block_time_step.h>

Inheritance diagram for H4::TimeStep4th:

Public Member Functions
	TimeStep4th ()
	acceleration offset to avoid too small step when weak acceleration exist More...
bool	checkParams ()
	check whether parameters values are correct More...
void	calcAcc0OffsetSq (const Float _mass, const Float _r, const Float _G)
	calculate a0_offset_sq More...
Float	calcDt2nd (const Float *acc0, const Float *acc1) const
	calculate 2nd order time step More...
Float	calcDt4th (const Float *acc0, const Float *acc1, const Float *acc2, const Float *acc3) const
	calculate 4th order time step More...
void	print (std::ostream &_fout) const
void	printColumnTitle (std::ostream &_fout, const int _width=20)
	print titles of class members using column style More...
void	printColumn (std::ostream &_fout, const int _width=20)
	print data of class members using column style More...
void	writeBinary (FILE *_fp) const
	write class data to file with binary format More...
void	readBinary (FILE *_fin)
	read class data to file with binary format More...

Public Attributes
Float	eta_4th
Float	eta_2nd
	time step coefficient (outside sqrt) for forth order More...
Float	acc0_offset_sq
	time step coefficient (outside sqrt) for second order More...

Constructor & Destructor Documentation

TimeStep4th()

H4::TimeStep4th::TimeStep4th ( )

inline

acceleration offset to avoid too small step when weak acceleration exist

Member Function Documentation

calcAcc0OffsetSq()

void H4::TimeStep4th::calcAcc0OffsetSq ( const Float  _mass, const Float  _r, const Float  _G  )

inline

calculate a0_offset_sq

calculate a0_offset_sq for timestep determination: (G*_mass/_r^2)^2

Parameters

[in]	_mass	mass criterion
[in]	_r	distance criterion
[in]	_G	gravitational constant

calcDt2nd()

Float H4::TimeStep4th::calcDt2nd ( const Float *  acc0, const Float *  acc1  ) const

inline

calculate 2nd order time step

calculate time step based on Acc and its derivatives

Parameters

[in]	acc0	acceleration
[in]	acc1	first order derivative of acc0

Returns

time step

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calcDt4th()

Float H4::TimeStep4th::calcDt4th ( const Float *  acc0, const Float *  acc1, const Float *  acc2, const Float *  acc3  ) const

inline

calculate 4th order time step

calculate time step based on Acc and its derivatives

Parameters

[in]	acc0	acceleration
[in]	acc1	first order derivative of acc0
[in]	acc2	second order derivative of acc0
[in]	acc3	thrid order derivative of acc0

Returns

time step

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checkParams()

bool H4::TimeStep4th::checkParams ( )

inline

check whether parameters values are correct

Returns

true: all correct

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print()

void H4::TimeStep4th::print ( std::ostream &  _fout ) const

inline

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printColumn()

void H4::TimeStep4th::printColumn ( std::ostream &  _fout, const int  _width = 20  )

inline

print data of class members using column style

print data of class members in one line for column style. Notice no newline is printed at the end

Parameters

[out]	_fout	std::ostream output object
[in]	_width	print width (defaulted 20)

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printColumnTitle()

void H4::TimeStep4th::printColumnTitle ( std::ostream &  _fout, const int  _width = 20  )

inline

print titles of class members using column style

print titles of class members in one line for column style

Parameters

[out]	_fout	std::ostream output object
[in]	_width	print width (defaulted 20)

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readBinary()

void H4::TimeStep4th::readBinary ( FILE *  _fin )

inline

read class data to file with binary format

Parameters

[in]

_fin

FILE type file for reading

writeBinary()

void H4::TimeStep4th::writeBinary ( FILE *  _fp ) const

inline

write class data to file with binary format

Parameters

[in]

_fp

FILE type file for output

Member Data Documentation

acc0_offset_sq

Float H4::TimeStep4th::acc0_offset_sq

time step coefficient (outside sqrt) for second order

eta_2nd

Float H4::TimeStep4th::eta_2nd

time step coefficient (outside sqrt) for forth order

eta_4th

Float H4::TimeStep4th::eta_4th

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The documentation for this class was generated from the following file:

• block_time_step.h