src/math/randomSPRNG.cpp

 /*
 * 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.
 */
 
#include <iostream>
#include <math.h>

#include "math/randomSPRNG.hpp"
#include "utils/simError.h"
#include <sprng.h>

#ifdef IS_MPI

#include <mpi.h>
#endif


/* randomStreamSPRNF creates a new SPRNG stream for random numbers
 */

int randomSPRNG::nStreamsInitialized = 0;

randomSPRNG::randomSPRNG( int iseed ) {
    int newSeed;
    nStreamsInitialized++;
    newSeed = abs(iseed) + nStreamsInitialized;

    if (newSeed < 0)
        newSeed = abs(newSeed);

#ifdef IS_MPI

    //random number generator should not depend on MpiSimulation
    MPI_Comm_size(MPI_COMM_WORLD, &nSPRNGStreams);
    myStreamNumber = worldRank;

#else

    nSPRNGStreams = 1;
    myStreamNumber = 0;

#endif

    thisStream = init_sprng(GTYPE, myStreamNumber, nSPRNGStreams, newSeed,
                            SPRNG_DEFAULT);
}

randomSPRNG::~randomSPRNG() {
    if (thisStream != NULL) {
        free_sprng(thisStream);
        nStreamsInitialized--;
    }
}

double randomSPRNG::getRandom() { return sprng(thisStream); }

// Gaussian SPRNG class...

double gaussianSPRNG::getGaussian() {
    double ranNum1;
    double ranNum2;
    double gaussianNumber;

    ranNum1 = getRandom();
    ranNum2 = getRandom();

    gaussianNumber = sqrt(-2.0 * log(ranNum1)) * cos(2 * M_PI * ranNum2);

    return gaussianNumber;
}
Revision:	1930
Committed:	Wed Jan 12 22:41:40 2005 UTC (19 years, 6 months ago) by gezelter
File size:	3377 byte(s)
Log Message:	merging new_design branch into OOPSE-2.0
#	User	Rev	Content
1	gezelter	1930	/*
2			* 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	gezelter	1490	#include <iostream>
43			#include <math.h>
44
45	tim	1492	#include "math/randomSPRNG.hpp"
46			#include "utils/simError.h"
47	gezelter	1490	#include <sprng.h>
48
49			#ifdef IS_MPI
50	gezelter	1930
51			#include <mpi.h>
52	gezelter	1490	#endif
53
54
55	gezelter	1930
56	gezelter	1490	/* randomStreamSPRNF creates a new SPRNG stream for random numbers
57			*/
58
59			int randomSPRNG::nStreamsInitialized = 0;
60
61	gezelter	1930	randomSPRNG::randomSPRNG( int iseed ) {
62			int newSeed;
63			nStreamsInitialized++;
64			newSeed = abs(iseed) + nStreamsInitialized;
65	gezelter	1490
66	gezelter	1930	if (newSeed < 0)
67			newSeed = abs(newSeed);
68
69	gezelter	1490	#ifdef IS_MPI
70
71	gezelter	1930	//random number generator should not depend on MpiSimulation
72			MPI_Comm_size(MPI_COMM_WORLD, &nSPRNGStreams);
73			myStreamNumber = worldRank;
74	gezelter	1490
75			#else
76
77	gezelter	1930	nSPRNGStreams = 1;
78			myStreamNumber = 0;
79	gezelter	1490
80			#endif
81
82	gezelter	1930	thisStream = init_sprng(GTYPE, myStreamNumber, nSPRNGStreams, newSeed,
83			SPRNG_DEFAULT);
84	gezelter	1490	}
85
86	gezelter	1930	randomSPRNG::~randomSPRNG() {
87			if (thisStream != NULL) {
88			free_sprng(thisStream);
89			nStreamsInitialized--;
90			}
91	gezelter	1490	}
92
93	gezelter	1930	double randomSPRNG::getRandom() { return sprng(thisStream); }
94	gezelter	1490
95			// Gaussian SPRNG class...
96
97	gezelter	1930	double gaussianSPRNG::getGaussian() {
98			double ranNum1;
99			double ranNum2;
100			double gaussianNumber;
101	gezelter	1490
102	gezelter	1930	ranNum1 = getRandom();
103			ranNum2 = getRandom();
104	gezelter	1490
105	gezelter	1930	gaussianNumber = sqrt(-2.0 * log(ranNum1)) * cos(2 * M_PI * ranNum2);
106	gezelter	1490
107	gezelter	1930	return gaussianNumber;
108	gezelter	1490	}