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A Normal / Exponential Random Generator and Histogram Class

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2 Dec 20024 min read 276.6K   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.
// MainFrm.h : interface of the CMainFrame class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_MAINFRM_H__F830419F_A316_430B_AB60_29B0CEE01A61__INCLUDED_)
#define AFX_MAINFRM_H__F830419F_A316_430B_AB60_29B0CEE01A61__INCLUDED_

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

#include "Histogram.h"

class CMainFrame : public CFrameWnd
{

protected: // create from serialization only
	CMainFrame();
	DECLARE_DYNCREATE(CMainFrame)

// Attributes
public:

// Operations
public:
	static enum EHistogramType
	{
		HistogramTypeNorm=0,
		HistogramTypeExp=1
	};

	void PlotHistogram( CPGLGraph* pGraph, const std::vector<float>& vData, LPCTSTR szTitle, EHistogramType eType);

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CMainFrame)
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CMainFrame();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:  // control bar embedded members

// Generated message map functions
protected:
	//{{AFX_MSG(CMainFrame)
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnHistogramsNormaldistribution();
	afx_msg void OnHistogramsExponentialdistribution();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};


/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MAINFRM_H__F830419F_A316_430B_AB60_29B0CEE01A61__INCLUDED_)

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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).

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