MOOSE: randnum/Normal.h Source File

00001 /*******************************************************************
00002  * File:            Normal.h
00003  * Description:      Generates random numbers with normal
00004  *                      distribution.
00005  * Author:          Subhasis Ray
00006  * E-mail:          ray.subhasis@gmail.com
00007  * Created:         2007-10-30 11:22:51
00008  ********************************************************************/
00009 /**********************************************************************
00010  ** This program is part of 'MOOSE', the
00011  ** Messaging Object Oriented Simulation Environment,
00012  ** also known as GENESIS 3 base code.
00013  **           copyright (C) 2003-2005 Upinder S. Bhalla. and NCBS
00014  ** It is made available under the terms of the
00015  ** GNU General Public License version 2
00016  ** See the file COPYING.LIB for the full notice.
00017  **********************************************************************/
00018 
00019 #ifndef _NORMAL_H
00020 #define _NORMAL_H
00021 #include "Probability.h"
00022 enum NormalGenerator
00023 {
00024     ALIAS,
00025     BOX_MUELLER,
00026     ZIGGURAT
00027 };
00028 
00029 class Normal : public Probability
00030 {
00031     
00032   public:
00033     Normal(double mean=0.0, double variance=1.0, NormalGenerator algorithm=ALIAS);
00034     double getMean()  const;
00035     void setMean(double value);
00036     double getVariance() const;
00037     void setVariance( double value );
00038     NormalGenerator getMethod(void);
00039     void setMethod(NormalGenerator method);
00040     double getNextSample() const;
00041   private:
00042     double mean_;
00043     double variance_;
00044     double (*generator_)();
00045     bool isStandard_;
00046     NormalGenerator method_;
00047     static double BoxMueller();
00048     static double aliasMethod();
00049     static double gslZiggurat();
00050     static bool testAcceptance(unsigned long t, unsigned long v);    
00051 };
00052 
00053     
00054 #endif