Random.h

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//            QMcBeaver
//
//         Constructed by 
//
//     Michael Todd Feldmann 
//              and 
//   David Randall "Chip" Kent IV
//
// Copyright 2000.  All rights reserved.
//
// drkent@users.sourceforge.net mtfeldmann@users.sourceforge.net

#ifndef RANDOM_H
#define RANDOM_H

#include <iostream>
#include <string>
#include <math.h>
#include <limits>

#ifdef USESPRNG
#include "sprng_cpp.h"
#endif

#ifdef PARALLEL
#include "mpi.h"
#endif

#define NTAB 32

using namespace std;
class Random
{
 private:
  long start;

  long current;

#ifdef USESPRNG

  Sprng * stream;

#endif

  //variables used by ran1
  long iy;
  long iv[NTAB];

  double ran1(long *idum);

 public:

  Random();

  ~Random();

  Random(long seed);

  Random(const Random & rhs);

  void initialize(long seed, int rank);

  void reset();

  void printStream(ostream & strm);

  void writeXML(ostream & strm);

  bool readXML(istream & strm);

  int intdev();

  double unidev();
    
  double gasdev();
  
  double expdev();

  double sindev();

  double sindev(double u);
  
  double randomDistribution1();

  double pdf2(double a, double zeta, double x);
  double randomDistribution2(double a, double zeta, double min, double max);
  
  double randomDistribution3(double F);
};  

extern Random ran;

#endif

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