67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
|
|
|
|
-----------------------------------------------------------------------------
|
|
eoNegExp.h
|
|
(c) GeNeura Team, 1998
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
This library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
Contact: todos@geneura.ugr.es, http://geneura.ugr.es
|
|
*/
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#ifndef _EONEGEXP_H
|
|
#define _EONEGEXP_H
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include <math.h>
|
|
|
|
#include <eoRnd.h> // for base class
|
|
#include <eoRNG.h> // for base class
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Class eoNegExp
|
|
//-----------------------------------------------------------------------------
|
|
|
|
/// Generates random numbers using a negative exponential distribution
|
|
template<class T>
|
|
class eoNegExp: public eoRnd<T>
|
|
{
|
|
public:
|
|
/**
|
|
* Default constructor.
|
|
* @param _mean Distribution mean
|
|
*/
|
|
eoNegExp(T _mean): eoRnd<T>(), mean(_mean) {};
|
|
|
|
/**
|
|
* Copy constructor.
|
|
* @param _rnd the copyee
|
|
*/
|
|
eoNegExp( const eoNegExp& _rnd): eoRnd<T>( _rnd), mean(_rnd.mean) {};
|
|
|
|
/// Returns an uniform dandom number over the interval [min, max).
|
|
virtual T operator()() {
|
|
return T( -mean*log((double)rng.rand() / rng.rand_max())); }
|
|
|
|
private:
|
|
T mean;
|
|
};
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#endif
|
|
|