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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _Erlang_h
#ifdef __GNUG__
#pragma interface
#endif
#define _Erlang_h 1
#include <Random.h>
class Erlang: public Random {
protected:
double pMean;
double pVariance;
int k;
double a;
void setState();
public:
Erlang(double mean, double variance, RNG *gen);
double mean();
double mean(double x);
double variance();
double variance(double x);
virtual double operator()();
};
inline void Erlang::setState() {
k = int( (pMean * pMean ) / pVariance + 0.5 );
k = (k > 0) ? k : 1;
a = k / pMean;
}
inline Erlang::Erlang(double mean, double variance, RNG *gen) : Random(gen)
{
pMean = mean; pVariance = variance;
setState();
}
inline double Erlang::mean() { return pMean; }
inline double Erlang::mean(double x) {
double tmp = pMean; pMean = x; setState(); return tmp;
};
inline double Erlang::variance() { return pVariance; }
inline double Erlang::variance(double x) {
double tmp = pVariance; pVariance = x; setState(); return tmp;
}
#endif
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