MOOSE: randnum/Gamma.h Source File

00001 /*******************************************************************
00002  * File:            Gamma.h
00003  * Description:      
00004  * Author:          Subhasis Ray
00005  * E-mail:          ray.subhasis@gmail.com
00006  * Created:         2007-11-05 19:22:32
00007  ********************************************************************/
00008 /**********************************************************************
00009 ** This program is part of 'MOOSE', the
00010 ** Messaging Object Oriented Simulation Environment,
00011 ** also known as GENESIS 3 base code.
00012 **           copyright (C) 2003-2005 Upinder S. Bhalla. and NCBS
00013 ** It is made available under the terms of the
00014 ** GNU General Public License version 2
00015 ** See the file COPYING.LIB for the full notice.
00016 **********************************************************************/
00017 
00018 #ifndef _GAMMA_H
00019 #define _GAMMA_H
00020 #include "Probability.h"
00021 #include <iostream>
00022 using namespace std;
00023 
00024 class Gamma: public Probability
00025 {
00026   public:
00027     Gamma(double alpha, double theta);
00028     double getAlpha();
00029     double getTheta();    
00030     double getMean()  const;
00031     double getVariance() const;
00032     double getNextSample() const;
00033   private:
00034     double alpha_;
00035     double theta_;
00036     double gammaSmall() const;
00037     double gammaLarge() const;
00038     
00039 };
00040 
00041     
00042 #endif