Random number generator namespace. More...

Functions
int	numbits (int x)
	Find the number of bits required to represent x.
void	initDefaultRNG ()
	Initialize the random number generator with a default seed.
void	initRNG ()
	Initialize the internals of the random number generator.
void	finalizeRNG ()
void	setrn (const Seed &seed)
	Initialize the random number generator seed.
void	savern (Seed &seed)
	Return a copy of the random number seed.
float	sranf (Seed &seed, Seed &skewed_seed, const Seed &seed_mult)
	Scalar random number generator. Done on the front end. *‍/.
void	sranf (float *d, int N, Seed &seed, ILatticeSeed &skewed_seed, const Seed &seed_mult)
	Scalar random number generator. Done on the front end. *‍/.

Variables
Seed	ran_seed
	Global (current) seed.
Seed	ran_mult
	RNG multiplier.
Seed	ran_mult_n
	RNG multiplier raised to the volume+1.
LatticeSeed *	lattice_ran_mult
	The lattice of skewed RNG multipliers.

Detailed Description

Random number generator namespace.

A collection of routines and data for supporting random numbers

It is a linear congruential with modulus m = 2**47, increment c = 0, and multiplier a = (2**36)*m3 + (2**24)*m2 + (2**12)*m1 + m0.

Function Documentation

◆ finalizeRNG()

void QDP::RNG::finalizeRNG ( )

Definition at line 169 of file qdp_random.cc.

References lattice_ran_mult.

Referenced by QDP::Layout::destroy().

◆ initDefaultRNG()

void QDP::RNG::initDefaultRNG ( void )

Initialize the random number generator with a default seed.

Default initialization of the RNG.

Uses arbitrary internal seed to initialize the RNG

Definition at line 44 of file qdp_random.cc.

References initRNG(), and setrn().

Referenced by QDP::Layout::initDefaults().

◆ initRNG()

void QDP::RNG::initRNG ( )

Initialize the internals of the random number generator.

Initialize the internals of the RNG.

Definition at line 54 of file qdp_random.cc.

References QDP::copymask(), QDP::QDPIO::cout, lattice_ran_mult, QDP::Layout::latticeCoordinate(), QDP::Layout::lattSize(), QDP::Nd, numbits(), QDP::QDP_error_exit(), ran_mult, ran_mult_n, QDP::setProfileLevel(), and QDP::Layout::vol().

Referenced by initDefaultRNG().

◆ numbits()

int QDP::RNG::numbits ( int x )

Find the number of bits required to represent x.

Definition at line 29 of file qdp_random.cc.

Referenced by initRNG().

◆ savern()

void QDP::RNG::savern ( Seed & lseed )

Return a copy of the random number seed.

Recover the current RNG seed.

Seeds are big-ints

Definition at line 184 of file qdp_random.cc.

References ran_seed.

◆ setrn()

void QDP::RNG::setrn ( const Seed & lseed )

Initialize the random number generator seed.

Initialize the RNG seed.

Seeds are big-ints

Definition at line 177 of file qdp_random.cc.

References ran_seed.

Referenced by initDefaultRNG().

◆ sranf() [1/2]

void QDP::RNG::sranf	(	float *	d,
		int	N,
		Seed &	seed,
		ILatticeSeed &	skewed_seed,
		const Seed &	seed_mult )

Scalar random number generator. Done on the front end. *‍/.

Internal seed multiplier.

It is linear congruential with modulus m = 2**47, increment c = 0, and multiplier a = (2**36)*m3 + (2**24)*m2 + (2**12)*m1 + m0.

Definition at line 243 of file qdp_random.cc.

References QDP::cast_rep(), QDP::getSite(), and QDP::seedToFloat().

◆ sranf() [2/2]

float QDP::RNG::sranf	(	Seed &	seed,
		Seed &	skewed_seed,
		const Seed &	seed_mult )

Scalar random number generator. Done on the front end. *‍/.

Internal seed multiplier.

It is linear congruential with modulus m = 2**47, increment c = 0, and multiplier a = (2**36)*m3 + (2**24)*m2 + (2**12)*m1 + m0.

Definition at line 195 of file qdp_random.cc.

References QDP::cast_rep(), and QDP::seedToFloat().

Referenced by QDP::fill_random(), QDP::fill_random(), QDP::fill_random(), and QDP::fill_random().

Variable Documentation

◆ lattice_ran_mult

LatticeSeed * QDP::RNG::lattice_ran_mult

The lattice of skewed RNG multipliers.

Definition at line 26 of file qdp_random.cc.

Referenced by finalizeRNG(), initRNG(), and QDP::random().

◆ ran_mult

Seed QDP::RNG::ran_mult

RNG multiplier.

Definition at line 22 of file qdp_random.cc.

Referenced by initRNG(), and QDP::random().

◆ ran_mult_n

Seed QDP::RNG::ran_mult_n

RNG multiplier raised to the volume+1.

Definition at line 24 of file qdp_random.cc.

Referenced by initRNG(), and QDP::random().

◆ ran_seed

Seed QDP::RNG::ran_seed

Global (current) seed.

Definition at line 20 of file qdp_random.cc.

Referenced by QDP::random(), QDP::random(), savern(), and setrn().

Functions

Variables