Chapter 4 Random Number Generator Speaker : H.M. Liang.

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Presentation transcript:

Chapter 4 Random Number Generator Speaker : H.M. Liang

Background Why random number is necessary? Seed and distribution  Random number generator is controlled by seed and distribution  In NS-2, different table is generated if seed is set to 0

TCL Create a random number generator set rng [new RNG] Set the random seed $rng seed 0 or n, n is an integer  seed 0 uses current time of day and counter The name of new generator

TCL Create an instance of a random variable object with specific distribution set rv [new Randomvariable/ ] Associate a RandomVariable with non-default RNG $rv use-rng $rng Generate a number $rv value

TCL - type of random-variable UniformRandomVariabletools/ranvar.h min_, max_ ExponentialRandomVariabletools/ranvar.h avg_ ParetoRandomVariabletools/ranvar.h avg_, shape_ ParetoIIRandomVariabletools/ranvar.h avg_, shape_ ConstantRandomVariabletools/ranvar.h val_ HyperExponentialRandomVariabletools/ranvar.h avg_, cov_ NormalRandomVariabletools/ranvar.h avg_, std_ LogNormalRandomVariabletools/ranvar.h avg_, std_

Distribution – Part I

Distribution – Part II

Example