PdfFuncMathMore.h

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// @(#)root/mathmore:$Id$
// Authors: L. Moneta, A. Zsenei   08/2005
 
 /**********************************************************************
  *                                                                    *
  * 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.             *
  *                                                                    *
  **********************************************************************/
 
 
#ifndef ROOT_Math_PdfFuncMathMore
#define ROOT_Math_PdfFuncMathMore
 
namespace ROOT {
   namespace Math {
 
 
  /**
 
  Probability density function of the non central \f$\chi^2\f$ distribution with \f$r\f$
  degrees of freedom and the noon-central parameter \f$\lambda\f$
 
  \f[ p_r(x) = \frac{1}{\Gamma(r/2) 2^{r/2}} x^{r/2-1} e^{-x/2} \f]
 
  for \f$x \geq 0\f$.
  For detailed description see
  <A HREF="http://mathworld.wolfram.com/NoncentralChi-SquaredDistribution.html">
  Mathworld</A>.
 
  @ingroup PdfFunc
 
  */
 
  double noncentral_chisquared_pdf(double x, double r, double lambda);
 
   }  //end namespace Math
} // end namespace ROOT
 
 
// make a fake class to auto-load functions from MathMore
 
namespace ROOT {
   namespace Math {
 
      class MathMoreLib {
 
      public:
 
         // adding this method with force the auto-loading of the library
         static void Load();
      };
 
      typedef MathMoreLib MathMoreLibrary; 
   }
 
}
 
 
 
#endif  // ROOT_Math_PdfFuncMathMore