HepJamesRandom

HepJamesRandom implements the algorithm by Marsaglia-Zaman RANMAR described in "F.James, Comp. Phys. Comm. 60 (1990) 329" and implemented in FORTRAN77 as part of the MATHLIB HEP library for pseudo-random numbers generation.

This is the default random engine invoked by each distribution unless the user sets a different one.

Author

See also

Engines: HepRandomEngine, DRand48Engine , DualRand Hurd160Engine Hurd288Engine MTwistEngine RandEngine RanecuEngine RanluxEngine Ranlux64Engine RanshiEngine TripleRand

Distributions: HepRandom, RandBinomial RandBreitWigner RandChiSquare RandExponential RandFlat RandGamma RandGauss RandGeneral RandPoisson RandStudentT

Declaration

#include "CLHEP/Random/JamesRandom.h"

class HepJamesRandom : public HepRandomEngine

Public Member Functions

Constructors

HepJamesRandom()

HepJamesRandom(long seed)

HepJamesRandom(HepInt rowIndex, HepInt colIndex)

HepJamesRandom(std::istream & is)

Copy constructor

HepJamesRandom(const HepJamesRandom & p)

Destructor

virtual ~HepJamesRandom()

Conversion operator

operator unsigned int()

32-bit flat, but slower than double or float.

=

HepJamesRandom & operator = (const HepJamesRandom &p)

Overloaded assignment operator, to retrieve the engine status.

flat

HepDouble flat()

Returns a pseudo random number between 0 and 1

(excluding the end points)

flatArray

void flatArray (const HepInt size, HepDouble* vect)

Fills an array vect of specified size with flat random values.

restoreStatus

void restoreStatus(const char filename[] = "JamesRand.conf")

Reads from file JamesRand.conf the last saved engine status and restores it.

saveStatus

void saveStatus(const char filename[] = "JamesRand.conf") const

Saves on file JamesRand.conf the current engine status.

setSeed

void setSeed(long seed, HepInt dum=0)

Sets the state of the algorithm according to seed.

setSeeds

void setSeeds(const long * seeds, HepInt dum=0)

Sets the state of the algorithm according to the zero terminated array of seeds. Only the first seed is used.

showStatus

void showStatus() const

Dumps the engine status on the screen.

Non-Member Functions

<<

std::ostream & operator<< (std::ostream & os, const HepJamesRandom & e)

Output to a stream.

>>

std::istream & operator>> (std::istream & is, HepJamesRandom & e)

Input from a stream.

Example