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Poisson.h
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1995-02-06
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// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Dirk Grunwald (grunwald@cs.uiuc.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _Poisson_h
#ifdef __GNUG__
#pragma interface
#pragma cplusplus
#endif
#define _Poisson_h
#include <Random.h>
class Poisson: public Random {
protected:
double pMean;
public:
Poisson(double mean, RNG *gen);
double mean();
double mean(double x);
virtual double operator()();
};
inline Poisson::Poisson(double mean, RNG *gen)
: Random(gen) {
pMean = mean;
}
inline double Poisson::mean() { return pMean; }
inline double Poisson::mean(double x) {
double t = pMean;
pMean = x;
return t;
}
#endif