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Chapter 4 Random Number Generator

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

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Chapter 4 Random Number Generator

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

  2. 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

  3. 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

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

  5. 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_

  6. Distribution – Part I

  7. Distribution – Part II

  8. Example

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