include/plaws/PoissonLaw.hpp

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00001 // PoissonLaw.hpp: this file is part of the REGAL project.
00002 //
00003 // REGAL : Random and Exhaustive Generators for Automata - Library
00004 //
00005 // Copyright (C) 2007 Julien DAVID.
00006 //
00007 // This program is free software; you can redistribute it and/or
00008 // modify it under the terms of the GNU General Public License
00009 // as published by the Free Software Foundation; either version 2
00010 // of the License, or (at your option) any later version.
00011 //
00012 // The complete GNU General Public Licence Notice can be found as the
00013 // `COPYING' file in the root directory.
00014 //
00015 //
00016 #ifndef POISSONLAW
00017 #define POISSONLAW
00018 
00019 
00020 #include"DiscreteProbabilityLaw.hpp"
00021 
00022 namespace regal{
00023 
00024   namespace plaws{
00025     
00026     class PoissonLaw: public DiscreteProbabilityLaw{
00027       
00028     private:
00029       
00030       virtual void updateProbability(const int & k){
00031         this->p=this->x*this->p/k;
00032       }
00033       
00034       virtual double initProbability(){
00035         return expl(-this->x);
00036       }
00037       
00038       
00039     public:
00040       
00041       
00046       PoissonLaw(const double & lambda):DiscreteProbabilityLaw::DiscreteProbabilityLaw(lambda){
00047       }
00048       
00052       ~PoissonLaw(){
00053         verbose("Destruction of a Poisson Law");
00054       }
00055     };
00056     
00057   }
00058 
00059 }
00060   
00061 #endif
00062   

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