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/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//////////////////////////////////////////////////////////////////////////////
// This file includes code derived from the original Mersenne Twister Code
// by Makoto Matsumoto and Takuji Nishimura
// and is subject to their original copyright notice copied below:
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
// COPYRIGHT NOTICE FOR MERSENNE TWISTER CODE
//
// Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. 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.
//
// 3. The names of its contributors may not be used to endorse or promote
// products derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef __RANDOM_H__
#define __RANDOM_H__
// Define a quick and dirty generator
#define RANDMUL 1664525L
#define RANDADD 1013904223L
#define RAND(seed) ((seed = seed * RANDMUL + RANDADD) & 0xFFFFFFFF)
class Random
// Implements the Mersenne Twister as default random number generator.
// Compilation flag __NO_MERSENNE sets default generator to
// a minimal Park-Miller with Bays-Durham shuffle and added safe guards.
{
protected:
// values for "minimal random values"
long seed;
long last;
long * shuffler;
// and for normal deviates
int normSaved;
double normStore;
double mersenneMult;
// Array for Mersenne state vector
unsigned long * mt;
// Used to signal that Mersenne state vector is not initialized
int mti;
public:
Random(long s = 0x7654321);
~Random();
// Next bit in series of 0s and 1s
int Binary(); // Next bit in series of 0s and 1s
// Next value in series, between 0 and 1
double Next();
// Next integer
unsigned long NextInt();
// Random number form N(0,1)
double Normal();
void Reset(long s);
void InitMersenne(unsigned long s);
// Random number between 0 and 1
operator double()
{
return Next();
}
// Random number between arbitrary bounds
double Uniform(double lo = 0.0, double hi = 1.0)
{
return lo + (hi - lo) * Next();
}
void Choose(int * array, int n, int k);
void Choose(int * array, float * weights, int n, int k);
};
extern Random globalRandom;
#endif
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