RanecuEngine

The algorithm originally written in FORTRAN77 as part of the MATHLIB HEP library.

The initialisation is carried out using a Multiplicative Congruential generator using formula constants of L'Ecuyer as described in "F.James, Comp. Phys. Comm. 60 (1990) 329-344".

Seeds are taken from a seed table given an index, the getSeed() method returns the current index in the seed table, the getSeeds() method returns a pointer to the couple of seeds stored in the local table of seeds at the current index.

Author

See also

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

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

Declaration

#include "CLHEP/Random/RanecuEngine.h"

class RanecuEngine : public HepRandomEngine

Public Member Functions

Constructors

RanecuEngine()

RanecuEngine(HepInt index)

RanecuEngine(std::istream& is)

Copy constructor

RanecuEngine(const RanecuEngine &p)

Destructor

virtual ~RanecuEngine()

Conversion operator

operator unsigned int()

32-bit int flat, faster in this case

=

RanecuEngine & operator = (const RanecuEngine &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 the array vect of specified size with flat random values.

restoreStatus

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

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

saveStatus

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

Saves on file Ranecu.conf the current engine status.

setIndex

void setIndex (long index)

Sets the state of the algorithm according to index, the position in the local table of seeds.

setSeed

void setSeed (long index, HepInt dum=0)

Resets the state of the algorithm according to index, the position in the static table of seeds stored in HepRandom.

setSeeds

void setSeeds (const long* seeds, HepInt index)

Sets the state of the algorithm according to the array of seeds seeds containing two seed values to be stored in the local table at index position.

showStatus

void showStatus() const

Dumps the engine status on the screen.

Non-Member Functions

<<

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

Output to a stream.

>>

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

Input from a stream.

Example