Use shoot(HepRandomEngine*) methods to shoot values using an engine different from the one set for the static generator.

• RanecuEngine* RNQ=new RanecuEngine;
  double exr=RandExponential::shoot(RNQ);
  int b=RandFlat::shootBit(RNQ);
  :
  const int size=32;
  double vect[size];
  RandFlat::shootArray(RNQ,size,vect);

Use shoot() static methods to shoot random values, given a distribution

• double v=RandFlat::shoot();
  double v=RandGauss::shoot();

Use static methods defined in HepRandom to set/get the initial seed to the current engine

• long new_seed=1894304173;
  HepRandom::setTheSeed(new_seed);
  long init_seed = HepRandom::getTheSeed();

Default engine of type HepJamesRandom already instantiated

Use static methods defined in HepRandom to set/get the main engine to the generator

• HepRandomEngine* theNewEngine = new RanecuEngine;
  HepRandom::setTheEngine(theNewEngine);
• HepRandomEngine* theEngine =
  HepRandom::getTheEngine();

By using the Static Generator defined in HepRandom

By skipping the Static Generator and specifying a local engine object

By skipping the Static Generator and instantiating a local distribution object associated to a local engine object

RanecuEngine

• Originally implemented in F77 by Fred James, part of MathLib HEP library.
• Uses a predefined table of couples of seeds to represent initial seeds and current seeds.
• SetSeed() method sets the index-position in the table of seeds (index%size in case the given value exceeds table size).
• SetSeeds() method sets the given couple of seeds as initial seeds in the table at a given position (optional).

Uniform interface: inheritance from

Collections of static and non-static methods

shootBit() method in RandFlat for fast