61d5ffaf10
issues in these areas:
.h's installed
.hP's installed
-lcurses interaction
files needed in ~/legal for copyleft reasons.
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
// 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 _LogNormal_h
|
|
#ifdef __GNUG__
|
|
#pragma interface
|
|
#endif
|
|
#define _LogNormal_h
|
|
|
|
#include <Normal.h>
|
|
|
|
class LogNormal: public Normal {
|
|
protected:
|
|
double logMean;
|
|
double logVariance;
|
|
void setState();
|
|
public:
|
|
LogNormal(double mean, double variance, RNG *gen);
|
|
double mean();
|
|
double mean(double x);
|
|
double variance();
|
|
double variance(double x);
|
|
virtual double operator()();
|
|
};
|
|
|
|
|
|
inline void LogNormal::setState()
|
|
{
|
|
double m2 = logMean * logMean;
|
|
pMean = log(m2 / sqrt(logVariance + m2) );
|
|
// from ch@heike.informatik.uni-dortmund.de:
|
|
// (was pVariance = log((sqrt(logVariance + m2)/m2 )); )
|
|
pStdDev = sqrt(log((logVariance + m2)/m2 ));
|
|
}
|
|
|
|
inline LogNormal::LogNormal(double mean, double variance, RNG *gen)
|
|
: Normal(mean, variance, gen)
|
|
{
|
|
logMean = mean;
|
|
logVariance = variance;
|
|
setState();
|
|
}
|
|
|
|
inline double LogNormal::mean() {
|
|
return logMean;
|
|
}
|
|
|
|
inline double LogNormal::mean(double x)
|
|
{
|
|
double t=logMean; logMean = x; setState();
|
|
return t;
|
|
}
|
|
|
|
inline double LogNormal::variance() {
|
|
return logVariance;
|
|
}
|
|
|
|
inline double LogNormal::variance(double x)
|
|
{
|
|
double t=logVariance; logVariance = x; setState();
|
|
return t;
|
|
}
|
|
|
|
#endif
|