61d5ffaf10
issues in these areas:
.h's installed
.hP's installed
-lcurses interaction
files needed in ~/legal for copyleft reasons.
71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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/*
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Copyright (C) 1988 Free Software Foundation
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written by Dirk Grunwald (grunwald@cs.uiuc.edu)
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This file is part of the GNU C++ Library. This library is free
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software; you can redistribute it and/or modify it under the terms of
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the GNU Library General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version. This library is distributed in the hope
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that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _HyperGeometric_h
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#ifdef __GNUG__
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#pragma interface
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#endif
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#define _HyperGeometric_h
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#include <Random.h>
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class HyperGeometric: public Random {
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protected:
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double pMean;
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double pVariance;
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double pP;
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void setState();
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public:
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HyperGeometric(double mean, double variance, RNG *gen);
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double mean();
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double mean(double x);
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double variance();
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double variance(double x);
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virtual double operator()();
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};
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inline void HyperGeometric::setState() {
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double z = pVariance / (pMean * pMean);
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pP = 0.5 * (1.0 - sqrt((z - 1.0) / ( z + 1.0 )));
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}
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inline HyperGeometric::HyperGeometric(double mean, double variance, RNG *gen)
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: Random(gen) {
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pMean = mean; pVariance = variance;
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setState();
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}
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inline double HyperGeometric::mean() { return pMean; };
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inline double HyperGeometric::mean(double x) {
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double t = pMean; pMean = x;
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setState(); return t;
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}
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inline double HyperGeometric::variance() { return pVariance; }
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inline double HyperGeometric::variance(double x) {
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double t = pVariance; pVariance = x;
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setState(); return t;
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}
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#endif
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