author | Raj Bhattacharjea <raj.b@gatech.edu> |
Tue, 20 Jan 2009 16:36:08 -0500 | |
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
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// |
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// Copyright (c) 2006 Georgia Tech Research Corporation |
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// |
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// This program is free software; you can redistribute it and/or modify |
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// it under the terms of the GNU General Public License version 2 as |
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// published by the Free Software Foundation; |
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// |
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// This program is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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// |
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// You should have received a copy of the GNU General Public License |
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// along with this program; if not, write to the Free Software |
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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// |
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// Author: Rajib Bhattacharjea<raj.b@gatech.edu> |
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// Author: Hadi Arbabi<marbabi@cs.odu.edu> |
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// |
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#ifndef __random_variable_h |
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#define __random_variable_h |
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#include <vector> |
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#include <algorithm> |
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#include <stdint.h> |
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#include <istream> |
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#include <ostream> |
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#include "attribute.h" |
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#include "attribute-helper.h" |
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/** |
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* \ingroup core |
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* \defgroup randomvariable Random Variable Distributions |
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* |
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*/ |
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namespace ns3{ |
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class RandomVariableBase; |
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class SeedManager |
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{ |
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private: |
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static uint32_t runNumber; |
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static bool seedSet; |
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static uint32_t seed_[6]; |
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public: |
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/** |
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* \brief set the seed |
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* it will duplicate the seed value 6 times |
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* \code |
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* SeedManger::SetSeed(15); |
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* UniformVariable x(2,3); //these will give the same output everytime |
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* ExponentialVariable y(120); //as long as the seed stays the same |
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* \endcode |
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* \param seed |
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*/ |
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static void SetSeed (uint32_t seed); |
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/** |
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* \brief Get the seed value |
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* \return seed value |
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*/ |
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static uint32_t GetSeed (); |
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/** |
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* \brief set the seed |
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* \code |
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* uint32_t seed[6]={10,5,2,3,5,11}; |
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* SeedManger::SetSeed(seed); |
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* UniformVariable x(2,3); //these will give the same output everytime |
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* ExponentialVariable y(120); //as long as the seed stays the same |
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* \endcode |
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* \param seed |
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*/ |
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static void SetSeed (uint32_t seed[6]); |
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/** |
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* \brief Get the seed value |
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* \param array of size 6 which will hold returned seed values |
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*/ |
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static void GetSeed (uint32_t seed[6]); |
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/** |
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* \brief Set the run number of simulation |
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* |
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* \code |
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* SeedManager::SetSeed(12); |
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* int N = atol(argv[1]); //read in run number from command line |
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* SeedManager::SetRun(N); |
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* UniformVariable x(0,10); |
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* ExponentialVariable y(2902); |
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* \endcode |
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* In this example, N could successivly be equal to 1,2,3, etc. and the user |
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* would continue to get independent runs out of the single simulation. For |
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* this simple example, the following might work: |
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* \code |
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* ./simulation 0 |
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* ...Results for run 0:... |
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* |
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* ./simulation 1 |
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* ...Results for run 1:... |
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* \endcode |
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*/ |
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static void SetRun (uint32_t run); |
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/** |
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* \brief Get the run number |
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* \return run number |
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*/ |
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static uint32_t GetRun (); |
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/** |
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* \brief Check if seed value is valid if wanted to be used as seed |
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* \return true if valid and false if invalid |
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*/ |
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static bool CheckSeed (uint32_t seed); |
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/** |
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* \brief Checks if seed array has valid values if wanted to be used as further seed |
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* \return true if valid and false if invalid |
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*/ |
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static bool CheckSeed (uint32_t seed[6]); |
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}; |
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/** |
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* \brief The basic RNG for NS-3. |
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* \ingroup randomvariable |
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* |
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* Note: The underlying random number generation method used |
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* by NS-3 is the RngStream code by Pierre L'Ecuyer at |
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* the University of Montreal. |
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* |
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* NS-3 has a rich set of random number generators. |
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* Class RandomVariable defines the base class functionalty |
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* required for all random number generators. By default, the underlying |
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* generator is seeded with the time of day, and then deterministically |
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* creates a sequence of seeds for each subsequent generator that is created. |
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* The rest of the documentation outlines how to change this behavior. |
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*/ |
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class RandomVariable |
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{ |
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public: |
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RandomVariable(); |
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RandomVariable(const RandomVariable&o); |
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RandomVariable &operator = (const RandomVariable &o); |
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~RandomVariable(); |
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|
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/** |
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* \brief Returns a random double from the underlying distribution |
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* \return A floating point random value |
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*/ |
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double GetValue (void) const; |
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|
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/** |
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* \brief Returns a random integer integer from the underlying distribution |
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* \return Integer cast of ::GetValue() |
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*/ |
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uint32_t GetInteger (void) const; |
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private: |
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friend std::ostream &operator << (std::ostream &os, const RandomVariable &var); |
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friend std::istream &operator >> (std::istream &os, RandomVariable &var); |
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RandomVariableBase *m_variable; |
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protected: |
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RandomVariable (const RandomVariableBase &variable); |
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RandomVariableBase *Peek (void) const; |
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}; |
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/** |
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* \brief The uniform distribution RNG for NS-3. |
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* \ingroup randomvariable |
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* |
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* This class supports the creation of objects that return random numbers |
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* from a fixed uniform distribution. It also supports the generation of |
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* single random numbers from various uniform distributions. |
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* |
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* The low end of the range is always included and the high end |
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* of the range is always excluded. |
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* \code |
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* UniformVariable x(0,10); |
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* x.GetValue(); //will always return numbers [0,10) |
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* UniformVariable::GetSingleValue(100,1000); //returns a value [100,1000) |
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* \endcode |
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*/ |
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class UniformVariable : public RandomVariable |
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{ |
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public: |
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/** |
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* Creates a uniform random number generator in the |
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* range [0.0 .. 1.0). |
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*/ |
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UniformVariable(); |
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/** |
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* Creates a uniform random number generator with the specified range |
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* \param s Low end of the range |
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* \param l High end of the range |
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*/ |
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UniformVariable(double s, double l); |
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/** |
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* \brief Returns a random double with the specified range given by constructor |
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* \return A floating point random value |
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*/ |
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double GetValue(); |
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/** |
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* \brief Returns a random double with the specified range |
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* \param s Low end of the range |
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* \param l High end of the range |
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* \return A floating point random value |
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*/ |
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double GetValue(double s, double l); |
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}; |
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/** |
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* \brief A random variable that returns a constant |
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* \ingroup randomvariable |
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* |
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* Class ConstantVariable defines a random number generator that |
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* returns the same value every sample. |
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*/ |
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class ConstantVariable : public RandomVariable { |
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public: |
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/** |
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* Construct a ConstantVariable RNG that returns zero every sample |
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*/ |
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ConstantVariable(); |
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|
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/** |
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* Construct a ConstantVariable RNG that returns the specified value |
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* every sample. |
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* \param c Unchanging value for this RNG. |
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*/ |
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ConstantVariable(double c); |
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/** |
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* \brief Specify a new constant RNG for this generator. |
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* \param c New constant value for this RNG. |
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*/ |
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void SetConstant(double c); |
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}; |
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/** |
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* \brief Return a sequential list of values |
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* \ingroup randomvariable |
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* |
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* Class SequentialVariable defines a random number generator that |
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* returns a sequential sequence. The sequence monotonically |
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* and begins monotonicaly increasing again. |
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*/ |
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class SequentialVariable : public RandomVariable |
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{ |
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public: |
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/** |
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* \brief Constructor for the SequentialVariable RNG. |
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* |
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* The four parameters define the sequence. For example |
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* SequentialVariable(0,5,1,2) creates a RNG that has the sequence |
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* 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 0, 0 ... |
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* \param f First value of the sequence. |
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* \param l One more than the last value of the sequence. |
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* \param i Increment between sequence values |
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* \param c Number of times each member of the sequence is repeated |
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*/ |
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SequentialVariable(double f, double l, double i = 1, uint32_t c = 1); |
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/** |
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* \brief Constructor for the SequentialVariable RNG. |
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* |
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* Differs from the first only in that the increment parameter is a |
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* random variable |
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* \param f First value of the sequence. |
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* \param l One more than the last value of the sequence. |
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* \param i Reference to a RandomVariable for the sequence increment |
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* \param c Number of times each member of the sequence is repeated |
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*/ |
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SequentialVariable(double f, double l, const RandomVariable& i, uint32_t c = 1); |
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|
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}; |
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/** |
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* \brief Exponentially Distributed random var |
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* \ingroup randomvariable |
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* |
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* This class supports the creation of objects that return random numbers |
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* from a fixed exponential distribution. It also supports the generation of |
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* single random numbers from various exponential distributions. |
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* |
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* The probability density function of an exponential variable |
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* is defined over the interval [0, +inf) as: |
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* \f$ \alpha e^{-\alpha x} \f$ |
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* where \f$ \alpha = \frac{1}{mean} \f$ |
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* |
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* The bounded version is defined over the internal [0,+inf) as: |
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* \f$ \left\{ \begin{array}{cl} \alpha e^{-\alpha x} & x < bound \\ bound & x > bound \end{array}\right. \f$ |
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* |
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309 |
* \code |
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* ExponentialVariable x(3.14); |
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311 |
* x.GetValue(); //will always return with mean 3.14 |
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* ExponentialVariable::GetSingleValue(20.1); //returns with mean 20.1 |
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* ExponentialVariable::GetSingleValue(108); //returns with mean 108 |
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314 |
* \endcode |
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* |
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*/ |
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317 |
class ExponentialVariable : public RandomVariable |
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318 |
{ |
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319 |
public: |
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320 |
/** |
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321 |
* Constructs an exponential random variable with a mean |
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* value of 1.0. |
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323 |
*/ |
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324 |
ExponentialVariable(); |
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325 |
|
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326 |
/** |
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327 |
* \brief Constructs an exponential random variable with a specified mean |
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328 |
* \param m Mean value for the random variable |
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329 |
*/ |
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330 |
explicit ExponentialVariable(double m); |
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331 |
|
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332 |
/** |
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333 |
* \brief Constructs an exponential random variable with spefified |
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* \brief mean and upper limit. |
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* |
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336 |
* Since exponential distributions can theoretically return unbounded values, |
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* it is sometimes useful to specify a fixed upper limit. Note however when |
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* the upper limit is specified, the true mean of the distribution is |
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* slightly smaller than the mean value specified. |
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* \param m Mean value of the random variable |
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* \param b Upper bound on returned values |
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342 |
*/ |
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ExponentialVariable(double m, double b); |
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|
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}; |
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/** |
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* \brief ParetoVariable distributed random var |
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* \ingroup randomvariable |
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* |
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* This class supports the creation of objects that return random numbers |
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* from a fixed pareto distribution. It also supports the generation of |
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* single random numbers from various pareto distributions. |
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* |
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* The probability density function is defined over the range [\f$x_m\f$,+inf) as: |
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356 |
* \f$ k \frac{x_m^k}{x^{k+1}}\f$ where \f$x_m > 0\f$ is called the location |
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* parameter and \f$ k > 0\f$ is called the pareto index or shape. |
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* |
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* The parameter \f$ x_m \f$ can be infered from the mean and the parameter \f$ k \f$ |
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* with the equation \f$ x_m = mean \frac{k-1}{k}, k > 1\f$. |
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* |
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362 |
* \code |
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363 |
* ParetoVariable x(3.14); |
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364 |
* x.GetValue(); //will always return with mean 3.14 |
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|
365 |
* ParetoVariable::GetSingleValue(20.1); //returns with mean 20.1 |
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* ParetoVariable::GetSingleValue(108); //returns with mean 108 |
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367 |
* \endcode |
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368 |
*/ |
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class ParetoVariable : public RandomVariable |
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{ |
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371 |
public: |
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372 |
/** |
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373 |
* Constructs a pareto random variable with a mean of 1 and a shape |
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* parameter of 1.5 |
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375 |
*/ |
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376 |
ParetoVariable (); |
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377 |
|
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378 |
/** |
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379 |
* Constructs a pareto random variable with specified mean and shape |
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380 |
* parameter of 1.5 |
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381 |
* \param m Mean value of the distribution |
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382 |
*/ |
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383 |
explicit ParetoVariable(double m); |
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384 |
|
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385 |
/** |
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386 |
* Constructs a pareto random variable with the specified mean value and |
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387 |
* shape parameter. |
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388 |
* \param m Mean value of the distribution |
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389 |
* \param s Shape parameter for the distribution |
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390 |
*/ |
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391 |
ParetoVariable(double m, double s); |
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392 |
|
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393 |
/** |
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394 |
* \brief Constructs a pareto random variable with the specified mean |
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395 |
* \brief value, shape (alpha), and upper bound. |
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396 |
* |
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* Since pareto distributions can theoretically return unbounded values, |
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398 |
* it is sometimes useful to specify a fixed upper limit. Note however |
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399 |
* when the upper limit is specified, the true mean of the distribution |
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400 |
* is slightly smaller than the mean value specified. |
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401 |
* \param m Mean value |
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|
402 |
* \param s Shape parameter |
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403 |
* \param b Upper limit on returned values |
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|
404 |
*/ |
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|
405 |
ParetoVariable(double m, double s, double b); |
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|
406 |
|
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|
407 |
}; |
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|
408 |
|
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|
409 |
/** |
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|
410 |
* \brief WeibullVariable distributed random var |
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|
411 |
* \ingroup randomvariable |
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412 |
* |
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|
413 |
* This class supports the creation of objects that return random numbers |
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|
414 |
* from a fixed weibull distribution. It also supports the generation of |
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|
415 |
* single random numbers from various weibull distributions. |
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|
416 |
* |
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|
417 |
* The probability density function is defined over the interval [0, +inf] |
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|
418 |
* as: \f$ \frac{k}{\lambda}\left(\frac{x}{\lambda}\right)^{k-1}e^{-\left(\frac{x}{\lambda}\right)^k} \f$ |
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|
419 |
* where \f$ k > 0\f$ is the shape parameter and \f$ \lambda > 0\f$ is the scale parameter. The |
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|
420 |
* specified mean is related to the scale and shape parameters by the following relation: |
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|
421 |
* \f$ mean = \lambda\Gamma\left(1+\frac{1}{k}\right) \f$ where \f$ \Gamma \f$ is the Gamma function. |
346
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|
422 |
*/ |
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423 |
class WeibullVariable : public RandomVariable { |
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|
424 |
public: |
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|
425 |
/** |
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|
426 |
* Constructs a weibull random variable with a mean |
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|
427 |
* value of 1.0 and a shape (alpha) parameter of 1 |
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|
428 |
*/ |
4a76f247e7dc
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|
429 |
WeibullVariable(); |
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|
430 |
|
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|
431 |
|
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|
432 |
/** |
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|
433 |
* Constructs a weibull random variable with the specified mean |
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|
434 |
* value and a shape (alpha) parameter of 1.5. |
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|
435 |
* \param m mean value of the distribution |
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|
436 |
*/ |
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|
437 |
WeibullVariable(double m) ; |
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|
438 |
|
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|
439 |
/** |
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|
440 |
* Constructs a weibull random variable with the specified mean |
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|
441 |
* value and a shape (alpha). |
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|
442 |
* \param m Mean value for the distribution. |
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443 |
* \param s Shape (alpha) parameter for the distribution. |
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|
444 |
*/ |
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|
445 |
WeibullVariable(double m, double s); |
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|
446 |
|
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447 |
/** |
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|
448 |
* \brief Constructs a weibull random variable with the specified mean |
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|
449 |
* \brief value, shape (alpha), and upper bound. |
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|
450 |
* Since WeibullVariable distributions can theoretically return unbounded values, |
346
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|
451 |
* it is sometimes usefull to specify a fixed upper limit. Note however |
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|
452 |
* that when the upper limit is specified, the true mean of the distribution |
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|
453 |
* is slightly smaller than the mean value specified. |
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|
454 |
* \param m Mean value for the distribution. |
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|
455 |
* \param s Shape (alpha) parameter for the distribution. |
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|
456 |
* \param b Upper limit on returned values |
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|
457 |
*/ |
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|
458 |
WeibullVariable(double m, double s, double b); |
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459 |
|
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460 |
}; |
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|
461 |
|
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462 |
/** |
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|
463 |
* \brief Class NormalVariable defines a random variable with a |
346
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|
464 |
* normal (Gaussian) distribution. |
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|
465 |
* \ingroup randomvariable |
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|
466 |
* |
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|
467 |
* This class supports the creation of objects that return random numbers |
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|
468 |
* from a fixed normal distribution. It also supports the generation of |
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|
469 |
* single random numbers from various normal distributions. |
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|
470 |
* |
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|
471 |
* The density probability function is defined over the interval (-inf,+inf) |
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|
472 |
* as: \f$ \frac{1}{\sigma\sqrt{2\pi}} e^{-\frac{(x-\mu)^2}{s\sigma^2}}\f$ |
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|
473 |
* where \f$ mean = \mu \f$ and \f$ variance = \sigma^2 \f$ |
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|
474 |
* |
346
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|
475 |
*/ |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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|
476 |
class NormalVariable : public RandomVariable |
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|
477 |
{ |
346
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|
478 |
public: |
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|
479 |
/** |
4a76f247e7dc
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parents:
diff
changeset
|
480 |
* Constructs an normal random variable with a mean |
4a76f247e7dc
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parents:
diff
changeset
|
481 |
* value of 0 and variance of 1. |
4a76f247e7dc
Add random number files, base class Application
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parents:
diff
changeset
|
482 |
*/ |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
483 |
NormalVariable(); |
4a76f247e7dc
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parents:
diff
changeset
|
484 |
|
4a76f247e7dc
Add random number files, base class Application
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parents:
diff
changeset
|
485 |
/** |
4223
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|
486 |
* \brief Construct a normal random variable with specified mean and variance. |
86a97665dcb0
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changeset
|
487 |
* \param m Mean value |
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4218
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|
488 |
* \param v Variance |
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|
489 |
*/ |
86a97665dcb0
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|
490 |
NormalVariable(double m, double v); |
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|
491 |
|
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|
492 |
/** |
346
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|
493 |
* \brief Construct a normal random variable with specified mean and variance |
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parents:
diff
changeset
|
494 |
* \param m Mean value |
4a76f247e7dc
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parents:
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|
495 |
* \param v Variance |
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4218
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|
496 |
* \param b Bound. The NormalVariable is bounded symetrically about the mean |
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Fix old code that crept in
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parents:
4218
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|
497 |
* [mean-bound,mean+bound] |
3267
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bug 181: Normal Variable Infinite Value & Bounds
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2969
diff
changeset
|
498 |
*/ |
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|
499 |
NormalVariable(double m, double v, double b); |
346
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|
500 |
}; |
4a76f247e7dc
Add random number files, base class Application
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parents:
diff
changeset
|
501 |
|
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
502 |
/** |
2762
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|
503 |
* \brief EmpiricalVariable distribution random var |
396
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|
504 |
* \ingroup randomvariable |
360
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diff
changeset
|
505 |
* |
346
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|
506 |
* Defines a random variable that has a specified, empirical |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
507 |
* distribution. The distribution is specified by a |
1872
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bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
508 |
* series of calls to the CDF member function, specifying a |
346
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parents:
diff
changeset
|
509 |
* value and the probability that the function value is less than |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
510 |
* the specified value. When values are requested, |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
511 |
* a uniform random variable is used to select a probabililty, |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
512 |
* and the return value is interpreted linerarly between the |
2762
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Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
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changeset
|
513 |
* two appropriate points in the CDF. The method is known |
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
514 |
* as inverse transform sampling: |
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
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changeset
|
515 |
* (http://en.wikipedia.org/wiki/Inverse_transform_sampling). |
346
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diff
changeset
|
516 |
*/ |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
517 |
class EmpiricalVariable : public RandomVariable { |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
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|
518 |
public: |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
519 |
/** |
2762
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|
520 |
* Constructor for the EmpiricalVariable random variables. |
346
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|
521 |
*/ |
4a76f247e7dc
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Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
522 |
explicit EmpiricalVariable(); |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
523 |
|
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
524 |
/** |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
525 |
* \brief Specifies a point in the empirical distribution |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
526 |
* \param v The function value for this point |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
527 |
* \param c Probability that the function is less than or equal to v |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
528 |
*/ |
2336
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
529 |
void CDF(double v, double c); // Value, prob <= Value |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
530 |
protected: |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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diff
changeset
|
531 |
EmpiricalVariable (const RandomVariableBase &variable); |
346
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parents:
diff
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|
532 |
}; |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
533 |
|
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
534 |
/** |
396
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364
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|
535 |
* \brief Integer-based empirical distribution |
7b4349cd88bc
add a randomvariable group
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parents:
364
diff
changeset
|
536 |
* \ingroup randomvariable |
7b4349cd88bc
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364
diff
changeset
|
537 |
* |
346
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Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
538 |
* Defines an empirical distribution where all values are integers. |
2762
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
539 |
* Indentical to EmpiricalVariable, except that the inverse transform |
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
540 |
* sampling interpolation described in the EmpiricalVariable documentation |
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
541 |
* is modified to only return integers. |
346
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Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
542 |
*/ |
2336
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
543 |
class IntEmpiricalVariable : public EmpiricalVariable |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
544 |
{ |
346
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parents:
diff
changeset
|
545 |
public: |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
546 |
IntEmpiricalVariable(); |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
547 |
}; |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
548 |
|
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
549 |
/** |
396
7b4349cd88bc
add a randomvariable group
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parents:
364
diff
changeset
|
550 |
* \brief a non-random variable |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
551 |
* \ingroup randomvariable |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
552 |
* |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
553 |
* Defines a random variable that has a specified, predetermined |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
554 |
* sequence. This would be useful when trying to force |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
555 |
* the RNG to return a known sequence, perhaps to |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
556 |
* compare NS-3 to some other simulator |
7b4349cd88bc
add a randomvariable group
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
364
diff
changeset
|
557 |
*/ |
2336
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
558 |
class DeterministicVariable : public RandomVariable |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
559 |
{ |
346
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Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
560 |
public: |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
561 |
/** |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
562 |
* \brief Constructor |
360
7bffd987426c
Fixed major memory bug and docs in RandomVariable
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
346
diff
changeset
|
563 |
* |
346
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
564 |
* Creates a generator that returns successive elements of the d array |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
565 |
* on successive calls to ::Value(). Note that the d pointer is copied |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
566 |
* for use by the generator (shallow-copy), not its contents, so the |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
567 |
* contents of the array d points to have to remain unchanged for the use |
2762
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
568 |
* of DeterministicVariable to be meaningful. |
346
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Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
569 |
* \param d Pointer to array of random values to return in sequence |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
570 |
* \param c Number of values in the array |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
571 |
*/ |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
572 |
explicit DeterministicVariable(double* d, uint32_t c); |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
573 |
}; |
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
574 |
|
438
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
575 |
|
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
576 |
/** |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
577 |
* \brief Log-normal Distributed random var |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
578 |
* \ingroup randomvariable |
1872
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
579 |
* |
2762
f56860663c54
Cleanup of RandomVariable doxygen (bug 110)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
2451
diff
changeset
|
580 |
* LogNormalVariable defines a random variable with log-normal |
438
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
581 |
* distribution. If one takes the natural logarithm of random |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
582 |
* variable following the log-normal distribution, the obtained values |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
583 |
* follow a normal distribution. |
442
96d3e7dc8bb2
Added static RNGs, like ExponentialVariable::GetSingleValue(mean)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
438
diff
changeset
|
584 |
* This class supports the creation of objects that return random numbers |
96d3e7dc8bb2
Added static RNGs, like ExponentialVariable::GetSingleValue(mean)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
438
diff
changeset
|
585 |
* from a fixed lognormal distribution. It also supports the generation of |
96d3e7dc8bb2
Added static RNGs, like ExponentialVariable::GetSingleValue(mean)
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
438
diff
changeset
|
586 |
* single random numbers from various lognormal distributions. |
1872
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
587 |
* |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
588 |
* The probability density function is defined over the interval [0,+inf) as: |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
589 |
* \f$ \frac{1}{x\sigma\sqrt{2\pi}} e^{-\frac{(ln(x) - \mu)^2}{2\sigma^2}}\f$ |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
590 |
* where \f$ mean = e^{\mu+\frac{\sigma^2}{2}} \f$ and |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
591 |
* \f$ variance = (e^{\sigma^2}-1)e^{2\mu+\sigma^2}\f$ |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
592 |
* |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
593 |
* The \f$ \mu \f$ and \f$ \sigma \f$ parameters can be calculated from the mean |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
594 |
* and standard deviation with the following equations: |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
595 |
* \f$ \mu = ln(mean) - \frac{1}{2}ln\left(1+\frac{stddev}{mean^2}\right)\f$, and, |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
596 |
* \f$ \sigma = \sqrt{ln\left(1+\frac{stddev}{mean^2}\right)}\f$ |
438
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
597 |
*/ |
2336
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
598 |
class LogNormalVariable : public RandomVariable |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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changeset
|
599 |
{ |
438
515bb5663cf3
Randomvariable Lognormal added
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parents:
423
diff
changeset
|
600 |
public: |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
601 |
/** |
1872
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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diff
changeset
|
602 |
* \param mu mu parameter of the lognormal distribution |
4dfb2a623722
bug 109: improve the doxygen documentation for RandomVariable
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
1806
diff
changeset
|
603 |
* \param sigma sigma parameter of the lognormal distribution |
438
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
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diff
changeset
|
604 |
*/ |
515bb5663cf3
Randomvariable Lognormal added
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parents:
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diff
changeset
|
605 |
LogNormalVariable (double mu, double sigma); |
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
606 |
}; |
515bb5663cf3
Randomvariable Lognormal added
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parents:
423
diff
changeset
|
607 |
|
942
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Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
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676
diff
changeset
|
608 |
/** |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
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diff
changeset
|
609 |
* \brief Triangularly Distributed random var |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
676
diff
changeset
|
610 |
* \ingroup randomvariable |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
611 |
* |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
612 |
* This distribution is a triangular distribution. The probablility density |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
613 |
* is in the shape of a triangle. |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
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diff
changeset
|
614 |
*/ |
2336
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2217
diff
changeset
|
615 |
class TriangularVariable : public RandomVariable |
28ce210b91bb
bug 133: automate RandomVariable memory management.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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diff
changeset
|
616 |
{ |
942
b65368bf40f9
Added Triangularly distributed random variables
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parents:
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diff
changeset
|
617 |
public: |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
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diff
changeset
|
618 |
/** |
b65368bf40f9
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parents:
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diff
changeset
|
619 |
* Creates a triangle distribution random number generator in the |
b65368bf40f9
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Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
620 |
* range [0.0 .. 1.0), with mean of 0.5 |
b65368bf40f9
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parents:
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diff
changeset
|
621 |
*/ |
b65368bf40f9
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parents:
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diff
changeset
|
622 |
TriangularVariable(); |
b65368bf40f9
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parents:
676
diff
changeset
|
623 |
|
b65368bf40f9
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parents:
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diff
changeset
|
624 |
/** |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
676
diff
changeset
|
625 |
* Creates a triangle distribution random number generator with the specified |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
626 |
* range |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
627 |
* \param s Low end of the range |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
628 |
* \param l High end of the range |
b65368bf40f9
Added Triangularly distributed random variables
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parents:
676
diff
changeset
|
629 |
* \param mean mean of the distribution |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
630 |
*/ |
b65368bf40f9
Added Triangularly distributed random variables
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
676
diff
changeset
|
631 |
TriangularVariable(double s, double l, double mean); |
4218
debf1a8a96d3
Proposed RNG API changes
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
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changeset
|
632 |
|
942
b65368bf40f9
Added Triangularly distributed random variables
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parents:
676
diff
changeset
|
633 |
}; |
438
515bb5663cf3
Randomvariable Lognormal added
Raj Bhattacharjea <raj.b@gatech.edu>
parents:
423
diff
changeset
|
634 |
|
2409
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convert RandomVariable, Rectangle, Vector, and Time to the new Class Helper
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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diff
changeset
|
635 |
std::ostream &operator << (std::ostream &os, const RandomVariable &var); |
8744ec60e8e6
convert RandomVariable, Rectangle, Vector, and Time to the new Class Helper
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parents:
2408
diff
changeset
|
636 |
std::istream &operator >> (std::istream &os, RandomVariable &var); |
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add Value support to RandomVariable.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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diff
changeset
|
637 |
|
2969
9d05d2a95dfa
improve the auto-generated doxygen output.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
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diff
changeset
|
638 |
/** |
9d05d2a95dfa
improve the auto-generated doxygen output.
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parents:
2965
diff
changeset
|
639 |
* \class ns3::RandomVariableValue |
9d05d2a95dfa
improve the auto-generated doxygen output.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2965
diff
changeset
|
640 |
* \brief hold objects of type ns3::RandomVariable |
9d05d2a95dfa
improve the auto-generated doxygen output.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2965
diff
changeset
|
641 |
*/ |
9d05d2a95dfa
improve the auto-generated doxygen output.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2965
diff
changeset
|
642 |
|
2445
e1b65471f159
convert RandomVariable to new helpers.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2439
diff
changeset
|
643 |
ATTRIBUTE_VALUE_DEFINE (RandomVariable); |
e1b65471f159
convert RandomVariable to new helpers.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2439
diff
changeset
|
644 |
ATTRIBUTE_CHECKER_DEFINE (RandomVariable); |
e1b65471f159
convert RandomVariable to new helpers.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2439
diff
changeset
|
645 |
ATTRIBUTE_ACCESSOR_DEFINE (RandomVariable); |
2384
500ada6a4874
add Value support to RandomVariable.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2336
diff
changeset
|
646 |
|
346
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
647 |
}//namespace ns3 |
2384
500ada6a4874
add Value support to RandomVariable.
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
2336
diff
changeset
|
648 |
|
500ada6a4874
add Value support to RandomVariable.
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parents:
2336
diff
changeset
|
649 |
|
346
4a76f247e7dc
Add random number files, base class Application
Tom Henderson <tomh@tomh.org>
parents:
diff
changeset
|
650 |
#endif |