Click here to Skip to main content
15,885,309 members
Articles / Programming Languages / C++

A Normal / Exponential Random Generator and Histogram Class

Rate me:
Please Sign up or sign in to vote.
4.73/5 (11 votes)
2 Dec 20024 min read 276.4K   8.1K   55  
A fast random generator with normal or exponential distribution + a histogram class
In this article, you will find a fast generator for Random Variable, namely normal and exponential distributions. It is based on George Marsaglia's and Wai Wan Tsang's work.
/*
Plot Graphic Library,
a C++/MFC charting library.

  Copyright (C) 2001  de Halleux Jonathan

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Contact: de Halleux Jonathan, pglinfo@patabelgos.org
*/
// PGLMapZ.h: interface for the CPGLMapZ class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_PGLMAPZ_H__9EF2A9DB_774D_4001_99FD_B4C7219CE7F3__INCLUDED_)
#define AFX_PGLMAPZ_H__9EF2A9DB_774D_4001_99FD_B4C7219CE7F3__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "PGLMap.h"
#include "PGLUtility.h"	// Added by ClassView

/*! \brief A height map on evenly spaced lattice.

\ingroup PGLMapGroup
*/
class PGL_EXT_CLASS CPGLMapZ : public CPGLMap  
{
DECLARE_SERIAL(CPGLMapZ);
public:
	/**@name Members*/
	//@{
	CPGLMapZ();
	//! copy constructor
	CPGLMapZ(const CPGLMapZ& l);
	//! assignment constructor
	CPGLMapZ& operator = (const CPGLMapZ& l);
	//i returns a pointer to a copy of the object
	virtual CPGLObject* MakeCopy()
	{	CPGLObject* pCopy=new CPGLMapZ(*this); return pCopy; };
	//! destructor
	~CPGLMapZ();

	//! adds context menu items...
	virtual void AddContextMenuItems(CMenu* pMenu);
	//! adds the line property page to the property sheet dialog.
	virtual void AddPropertyPage(CPropertySheet *pPropSheet);

    /*! \brief plotting function

	Plots the height map using the current colormap.

	\param pDC a valid devied context associated to the current OpenGL context.
	\param pView a valid view
	\param renderToSelect if TRUE, the object ID is loaded in the OpenGL name pile
	  \sa CPGLGraph::Plot
	  \sa PlotToEPS
	  \sa glLoadName
	*/
    /*! \brief export to EPS

	Plots the height map using the current colormap in an open EPS file.

	\param pFile a valid open file (text mode)
	\param pView a valid view
	  \sa CPGLGraph::Plot
	  \sa PlotToEPS
	  \sa glLoadName
	*/
	virtual void PlotGfx(gfxinterface::CGfxInterface& gfx);

	//! sets the array z must be of size $n_x \times n_y$. Memory deallocation is done by PGL
	void SetDatas(double* pZ);
	//! sets the array z must be of size $n_x \times n_y$. It makes it's own copy.
	void SetDatas(const std::vector<double>& pZ);
	//! returns a pointer to the array z
	double* GetDatas()
	{	return m_pZ;};
	//! returns minimum value of Z
	double GetMin() const
	{	return m_dMin;};
	//! returns maximum value of Z
	double GetMax() const
	{	return m_dMax;};
	/*! \brief returns colormap type

	Returns the type of color maps.
	\sa PGL_COLORMAP
	*/
	PGL_COLORMAP GetColorMap() const
	{	return m_eCMap;};
	//! set the type of colormap
	void SetColorMap(PGL_COLORMAP eCMap)
	{	m_eCMap=eCMap;};

	//! Serialize functions
	void Serialize(CArchive& archive);

	/// Debuggin functions
	#ifdef _DEBUG
	    virtual void Dump( CDumpContext& dc ) const;
	    virtual void AssertValid() const;   
	#endif
	//@}
protected:
    /**@name Attributes*/
    //@{
	//! an array \f$n_x \times n_y\f$
	double* m_pZ;
	//! color map
	PGL_COLORMAP m_eCMap;
	//@}
private:
    /**@name Private Attributes*/
    //@{ 
	//! \f$\min z(x,y)\f$
	double m_dMin;
	//! \f$\max z(x,y)\f$
	double m_dMax;
	//@}
};

#endif // !defined(AFX_PGLMAPZ_H__9EF2A9DB_774D_4001_99FD_B4C7219CE7F3__INCLUDED_)

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.


Written By
Engineer
United States United States
Jonathan de Halleux is Civil Engineer in Applied Mathematics. He finished his PhD in 2004 in the rainy country of Belgium. After 2 years in the Common Language Runtime (i.e. .net), he is now working at Microsoft Research on Pex (http://research.microsoft.com/pex).

Comments and Discussions