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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 _Normal_h
- #ifdef __GNUG__
- #pragma interface
- #endif
- #define _Normal_h
-
- #include <Random.h>
-
- class Normal: public Random {
- char haveCachedNormal;
- double cachedNormal;
-
- protected:
- double pMean;
- double pVariance;
- double pStdDev;
-
- public:
- Normal(double xmean, double xvariance, RNG *gen);
- double mean();
- double mean(double x);
- double variance();
- double variance(double x);
- virtual double operator()();
- };
-
-
- inline Normal::Normal(double xmean, double xvariance, RNG *gen)
- : Random(gen) {
- pMean = xmean;
- pVariance = xvariance;
- pStdDev = sqrt(pVariance);
- haveCachedNormal = 0;
- }
-
- inline double Normal::mean() { return pMean; };
- inline double Normal::mean(double x) {
- double t=pMean; pMean = x;
- return t;
- }
-
- inline double Normal::variance() { return pVariance; }
- inline double Normal::variance(double x) {
- double t=pVariance; pVariance = x;
- pStdDev = sqrt(pVariance);
- return t;
- };
-
- #endif
-