VavilovAccuratePdf.cxx

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// @(#)root/mathmore:$Id$
// Authors: B. List 29.4.2010


 /**********************************************************************
  *                                                                    *
  * Copyright (c) 2004 ROOT Foundation,  CERN/PH-SFT                   *
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  * This library is free software; you can redistribute it and/or      *
  * modify it under the terms of the GNU General Public License        *
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  * This library is distributed in the hope that it will be useful,    *
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// Implementation file for class VavilovAccuratePdf
//
// Created by: blist  at Thu Apr 29 11:19:00 2010
//
// Last update: Thu Apr 29 11:19:00 2010
//

#include "Math/VavilovAccuratePdf.h"
#include "Math/VavilovAccurate.h"

namespace ROOT {
namespace Math {


VavilovAccuratePdf::VavilovAccuratePdf() {
   fP[0] = 1;
   fP[1] = 0;
   fP[2] = 1;
   fP[3] = 1;
   fP[4] = 1;
}

VavilovAccuratePdf::VavilovAccuratePdf(const double *p) {
   if (p)
      for (int i = 0; i < 5; ++i)
         fP[i] = p[i];
   else {
      fP[0] = 1;
      fP[1] = 0;
      fP[2] = 1;
      fP[3] = 1;
      fP[4] = 1;
   }
}

VavilovAccuratePdf::~VavilovAccuratePdf ()
{}

const double * VavilovAccuratePdf::Parameters() const {
   return fP;
}

void VavilovAccuratePdf::SetParameters(const double * p ) {
   if (p)
      for (int i = 0; i < 5; ++i)
         fP[i] = p[i];
}

unsigned int VavilovAccuratePdf::NPar() const {
  return 5;
}

std::string VavilovAccuratePdf::ParameterName(unsigned int i) const {
   switch (i) {
      case 0: return "Norm"; break;
      case 1: return "x0"; break;
      case 2: return "xi"; break;
      case 3: return "kappa"; break;
      case 4: return "beta2"; break;
   }
   return "???";
}

double VavilovAccuratePdf::DoEval(double x) const {
   VavilovAccurate v(fP[3], fP[4]);
   return fP[0]/fP[2]*v.Pdf ((x-fP[1])/fP[2]);
}

double VavilovAccuratePdf::DoEvalPar(double x, const double * p) const {
   if (!p) return 0;
   // p[0]: norm, p[1]: x0, p[2]: width, p[3]: kappa, p[4]: beta2
   VavilovAccurate v(p[3], p[4]);
   return p[0]/p[2]*v.Pdf ((x-p[1])/p[2]);
}

IBaseFunctionOneDim  * VavilovAccuratePdf::Clone() const {
   return new VavilovAccuratePdf (*this);
}


} // namespace Math
} // namespace ROOT