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// File Uniform01WH.h
// Author : Sylvain Gaillard
// Last modification : Friday September 24 2004
//
/*
Copyright or © or Copr. CNRS, (November 17, 2004)
This software is a computer program whose purpose is to provide classes
for numerical calculus.
This software is governed by the CeCILL license under French law and
abiding by the rules of distribution of free software. You can use,
modify and/ or redistribute the software under the terms of the CeCILL
license as circulated by CEA, CNRS and INRIA at the following URL
"http://www.cecill.info".
As a counterpart to the access to the source code and rights to copy,
modify and redistribute granted by the license, users are provided only
with a limited warranty and the software's author, the holder of the
economic rights, and the successive licensors have only limited
liability.
In this respect, the user's attention is drawn to the risks associated
with loading, using, modifying and/or developing or reproducing the
software by the user in light of its specific status of free software,
that may mean that it is complicated to manipulate, and that also
therefore means that it is reserved for developers and experienced
professionals having in-depth computer knowledge. Users are therefore
encouraged to load and test the software's suitability as regards their
requirements in conditions enabling the security of their systems and/or
data to be ensured and, more generally, to use and operate it in the
same conditions as regards security.
The fact that you are presently reading this means that you have had
knowledge of the CeCILL license and that you accept its terms.
*/
#ifndef _UNIFORM01WH_H_
#define _UNIFORM01WH_H_
#include "RandomFactory.h"
namespace bpp
{
/**
* @brief A uniform random number generator.
*
* This is a congruential uniform generator which draw double between 0 and 1 excluding
* the end points.
* This generator is based on a Fortan routine from Wichmann, B. A. and Hill, I. D. (1982).
* "An efficient and portable pseudorandom number generator," Applied Statistics, 31, 188-190
*/
class Uniform01WH : public virtual RandomFactory
{
public: // Constructors and destructor
/**
* @brief Create a Random Number Generator.
*
* @param seed The seed for the random numbers.
*/
Uniform01WH(long seed) : ix(seed), iy(seed), iz(seed) {}
/**
* @brief Destroy the generator.
*/
virtual ~Uniform01WH();
public:
/**
* @brief Set the seed for a new set of random numbers.
*/
void setSeed(long seed) { setSeeds(seed); }
/**
* @brief Set the three seeds.
*/
void setSeeds(long seed1, long seed2 = 20356, long seed3 = 35412)
{
ix = seed1; iy = seed2; iz = seed3;
}
/**
* @brief Get a random number between 0.0 and 1.0 (exclusive of the end point values).
*/
double drawNumber() const;
private:
mutable long ix, iy, iz;
};
} //end of namespace bpp.
#endif // _UNIFORM01WH_H_
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