/usr/include/votca/tools/random.h is in libvotca-tools-dev 1.3.0-2+b2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /*
* Copyright 2009-2011 The VOTCA Development Team (http://www.votca.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/*************************************************
MARSAGLIA pseudo random number generator
See: G. Marsaglia and A. Zaman. Toward a universal random number generator,
Statistics & Probability Letters, 9(1):35–39, 1990.
This function returns a double precision floating point number
uniformly distributed in the range [0,1)
*************************************************/
#ifndef _RANMARS_H_
#define _RANMARS_H_
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MARS_FIELD_SIZE 98
#define _pi 3.1415926535897932384626433832795
namespace votca { namespace tools {
/**
\brief MARSAGLIA pseudo random number generator
This class generates double precision floating point numbers
uniformly distributed in the range [0,1)
*/
class Random
{
public:
static void init( int nA1, int nA2, int nA3, int nB1 );
static double rand_uniform( void );
static int rand_uniform_int( int max_int );
static double rand_gaussian( double sigma );
static void save( char *fileName );
static void restore( char *fileName );
private:
static double *MARSarray, MARSc, MARScd, MARScm ;
static int MARSi, MARSj ;
};
}}
#endif /* _RANMARS_H_ */
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