// 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.
class LogNormal
: public Normal
{
LogNormal(double mean
, double variance
, RNG
*gen
);
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
)
inline double LogNormal::mean() {
inline double LogNormal::mean(double x
)
double t
=logMean
; logMean
= x
; setState();
inline double LogNormal::variance() {
inline double LogNormal::variance(double x
)
double t
=logVariance
; logVariance
= x
; setState();