/usr/include/root/Math/VavilovAccurateQuantile.h is in libroot-math-mathmore-dev 5.34.14-1build1.
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// Authors: B. List 29.4.2010
/**********************************************************************
* *
* Copyright (c) 2004 ROOT Foundation, CERN/PH-SFT *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU 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 *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this library (see file COPYING); if not, write *
* to the Free Software Foundation, Inc., 59 Temple Place, Suite *
* 330, Boston, MA 02111-1307 USA, or contact the author. *
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**********************************************************************/
// Header file for class VavilovAccurateQuantile
//
// Created by: blist at Thu Apr 29 11:19:00 2010
//
// Last update: Thu Apr 29 11:19:00 2010
//
#ifndef ROOT_Math_VavilovAccurateQuantile
#define ROOT_Math_VavilovAccurateQuantile
#include "Math/IParamFunction.h"
#include "Math/VavilovAccurate.h"
#include <memory>
namespace ROOT {
namespace Math {
//____________________________________________________________________________
/**
Class describing the Vavilov quantile function.
The probability density function of the Vavilov distribution
is given by:
\f[ p(\lambda; \kappa, \beta^2) =
\frac{1}{2 \pi i}\int_{c-i\infty}^{c+i\infty} \phi(s) e^{\lambda s} ds\f]
where \f$\phi(s) = e^{C} e^{\psi(s)}\f$
with \f$ C = \kappa (1+\beta^2 \gamma )\f$
and \f$\psi(s)&=& s \ln \kappa + (s+\beta^2 \kappa)
\cdot \left ( \int \limits_{0}^{1}
\frac{1 - e^{\frac{-st}{\kappa}}}{t} \,\der t- \gamma \right )
- \kappa \, e^{\frac{-s}{\kappa}}\f$.
\f$ \gamma = 0.5772156649\dots\f$ is Euler's constant.
The parameters are:
- 0: Norm: Normalization constant
- 1: x0: Location parameter
- 2: xi: Width parameter
- 3: kappa: Parameter \f$\kappa\f$ of the Vavilov distribution
- 4: beta2: Parameter \f$\beta^2\f$ of the Vavilov distribution
Benno List, June 2010
@ingroup StatFunc
*/
class VavilovAccurateQuantile: public IParametricFunctionOneDim {
public:
/**
Default constructor
*/
VavilovAccurateQuantile();
/**
Constructor with parameter values
@param p vector of doubles containing the parameter values (Norm, x0, xi, kappa, beta2).
*/
VavilovAccurateQuantile(const double *p);
/**
Destructor
*/
virtual ~VavilovAccurateQuantile ();
/**
Access the parameter values
*/
virtual const double * Parameters() const;
/**
Set the parameter values
@param p vector of doubles containing the parameter values (Norm, x0, xi, kappa, beta2).
*/
virtual void SetParameters(const double * p );
/**
Return the number of Parameters
*/
virtual unsigned int NPar() const;
/**
Return the name of the i-th parameter (starting from zero)
*/
virtual std::string ParameterName(unsigned int i) const;
/**
Evaluate the function
@param x The Quantile \f$z\f$ , \f$0 \le z \le 1\f$
*/
virtual double DoEval(double x) const;
/**
Evaluate the function, using parameters p
@param x The Quantile \f$z\f$, \f$0 \le z \le 1\f$
@param p vector of doubles containing the parameter values (Norm, x0, xi, kappa, beta2).
*/
virtual double DoEvalPar(double x, const double * p) const;
/**
Return a clone of the object
*/
virtual IBaseFunctionOneDim * Clone() const;
private:
double fP[5];
};
} // namespace Math
} // namespace ROOT
#endif /* ROOT_Math_VavilovAccurateQuantile */
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