src/math/RandNumGen.hpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, provided
 * that the following conditions are met:
 *
 * 1. Acknowledgement of the program authors must be made in any
 *    publication of scientific results based in part on use of the
 *    program.  An acceptable form of acknowledgement is citation of
 *    the article in which the program was described (Matthew
 *    A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
 *    J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
 *    Parallel Simulation Engine for Molecular Dynamics,"
 *    J. Comput. Chem. 26, pp. 252-271 (2005))
 *
 * 2. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 3. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 */

#ifndef MATH_RANDNUMGEN_HPP
#define MATH_RANDNUMGEN_HPP

#include <vector>
#include "config.h"
#include "MersenneTwister.hpp"
#include "utils/simError.h"


namespace oopse {


  /**
   * @class RandNumGen a random number generator class
   */
  class RandNumGen{
  public:
    typedef unsigned long uint32; 
        
    virtual ~RandNumGen() {
      delete mtRand_;
    }
        
    /** Returns a real number in [0,1] */
    RealType rand() {
      return mtRand_->rand();
    }

    /** Returns a real number in [0, n] */
    RealType rand( const RealType& n ) {
      return mtRand_->rand(n);
    }

    /** Returns a real number in [0, 1) */
    RealType randExc() {
      return mtRand_->randExc();
    }

    /** Returns a real number in [0, n) */        
    RealType randExc( const RealType& n ) {
      return mtRand_->randExc(n);
    }

    /** Returns a real number in (0, 1) */                
    RealType randDblExc() {
      return mtRand_->randDblExc();
    }

    /** Returns a real number in (0, n) */                        
    RealType randDblExc( const RealType& n ) {
      return mtRand_->randDblExc(n);
    }

    /** Returns aninteger in [0,2^32-1]  */            
    uint32 randInt() {
      return mtRand_->randInt();
    }

    /** Returns aninteger in [0, n]  for n < 2^32 */     
    uint32 randInt( const uint32& n ) {
      return mtRand_->randInt(n);
    }
        
    /** Returns a 53-bitreal number in [0,1) (capacity of IEEE RealType precision) */
    RealType rand53() {
      return mtRand_->rand53();
    }
        
    /** Access to nonuniform random number distributions */
    RealType randNorm( const RealType mean, const RealType variance) {
      return mtRand_->randNorm(mean, variance);
    }
        
    // Re-seeding functions with same behavior as initializers
    virtual void seed( const uint32 oneSeed ) = 0;
        
    virtual void seed()= 0;

  protected:
        
    MTRand* mtRand_;


  };

}

#endif 

Revision:	2759
Committed:	Wed May 17 21:51:42 2006 UTC (18 years, 1 month ago) by tim
File size:	4017 byte(s)
Log Message:	Adding single precision capabilities to c++ side
#	User	Rev	Content
1	gezelter	2204	/*
2	tim	2078	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3			*
4			* The University of Notre Dame grants you ("Licensee") a
5			* non-exclusive, royalty free, license to use, modify and
6			* redistribute this software in source and binary code form, provided
7			* that the following conditions are met:
8			*
9			* 1. Acknowledgement of the program authors must be made in any
10			* publication of scientific results based in part on use of the
11			* program. An acceptable form of acknowledgement is citation of
12			* the article in which the program was described (Matthew
13			* A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher
14			* J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented
15			* Parallel Simulation Engine for Molecular Dynamics,"
16			* J. Comput. Chem. 26, pp. 252-271 (2005))
17			*
18			* 2. Redistributions of source code must retain the above copyright
19			* notice, this list of conditions and the following disclaimer.
20			*
21			* 3. Redistributions in binary form must reproduce the above copyright
22			* notice, this list of conditions and the following disclaimer in the
23			* documentation and/or other materials provided with the
24			* distribution.
25			*
26			* This software is provided "AS IS," without a warranty of any
27			* kind. All express or implied conditions, representations and
28			* warranties, including any implied warranty of merchantability,
29			* fitness for a particular purpose or non-infringement, are hereby
30			* excluded. The University of Notre Dame and its licensors shall not
31			* be liable for any damages suffered by licensee as a result of
32			* using, modifying or distributing the software or its
33			* derivatives. In no event will the University of Notre Dame or its
34			* licensors be liable for any lost revenue, profit or data, or for
35			* direct, indirect, special, consequential, incidental or punitive
36			* damages, however caused and regardless of the theory of liability,
37			* arising out of the use of or inability to use software, even if the
38			* University of Notre Dame has been advised of the possibility of
39			* such damages.
40			*/
41
42			#ifndef MATH_RANDNUMGEN_HPP
43			#define MATH_RANDNUMGEN_HPP
44
45			#include <vector>
46	tim	2759	#include "config.h"
47	tim	2078	#include "MersenneTwister.hpp"
48			#include "utils/simError.h"
49
50
51			namespace oopse {
52
53
54
55	gezelter	2204	/**
56			* @class RandNumGen a random number generator class
57			*/
58			class RandNumGen{
59			public:
60			typedef unsigned long uint32;
61	tim	2078
62	gezelter	2204	virtual ~RandNumGen() {
63			delete mtRand_;
64			}
65	tim	2078
66	gezelter	2204	/** Returns a real number in [0,1] */
67	tim	2759	RealType rand() {
68	gezelter	2204	return mtRand_->rand();
69			}
70	tim	2078
71	gezelter	2204	/** Returns a real number in [0, n] */
72	tim	2759	RealType rand( const RealType& n ) {
73	gezelter	2204	return mtRand_->rand(n);
74			}
75	tim	2078
76	gezelter	2204	/** Returns a real number in [0, 1) */
77	tim	2759	RealType randExc() {
78	gezelter	2204	return mtRand_->randExc();
79			}
80	tim	2078
81	gezelter	2204	/** Returns a real number in [0, n) */
82	tim	2759	RealType randExc( const RealType& n ) {
83	gezelter	2204	return mtRand_->randExc(n);
84			}
85	tim	2078
86	gezelter	2204	/** Returns a real number in (0, 1) */
87	tim	2759	RealType randDblExc() {
88	gezelter	2204	return mtRand_->randDblExc();
89			}
90	tim	2078
91	gezelter	2204	/** Returns a real number in (0, n) */
92	tim	2759	RealType randDblExc( const RealType& n ) {
93	gezelter	2204	return mtRand_->randDblExc(n);
94			}
95	tim	2078
96	gezelter	2204	/** Returns aninteger in [0,2^32-1] */
97			uint32 randInt() {
98			return mtRand_->randInt();
99			}
100	tim	2078
101	gezelter	2204	/** Returns aninteger in [0, n] for n < 2^32 */
102			uint32 randInt( const uint32& n ) {
103			return mtRand_->randInt(n);
104			}
105	tim	2078
106	tim	2759	/** Returns a 53-bitreal number in [0,1) (capacity of IEEE RealType precision) */
107			RealType rand53() {
108	gezelter	2204	return mtRand_->rand53();
109			}
110	tim	2078
111	gezelter	2204	/** Access to nonuniform random number distributions */
112	tim	2759	RealType randNorm( const RealType mean, const RealType variance) {
113	gezelter	2204	return mtRand_->randNorm(mean, variance);
114			}
115	tim	2078
116	gezelter	2204	// Re-seeding functions with same behavior as initializers
117			virtual void seed( const uint32 oneSeed ) = 0;
118	tim	2078
119	gezelter	2204	virtual void seed()= 0;
120	tim	2078
121	gezelter	2204	protected:
122	tim	2078
123	gezelter	2204	MTRand* mtRand_;
124	tim	2078
125
126	gezelter	2204	};
127	tim	2078
128			}
129
130			#endif
131