00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // 00028 // $Id: Gamma.hh 69796 2013-05-15 13:26:12Z gcosmo $ 00029 // 00030 // 00031 //--------------------------------------------------------------- 00032 // GEANT 4 class header file 00033 // 00034 // Gamma 00035 // 00036 // Class description: 00037 // 00038 // Gamma function. 00039 00040 //--------------------------------------------------------------- 00041 #ifndef MYGAMMA_H 00042 #define MYGAMMA_H 00043 00044 #include <cmath> 00045 00046 class MyGamma 00047 { 00048 public: 00049 00050 MyGamma (); 00051 ~MyGamma(); 00052 00053 double Gamma(double z); 00054 double Gamma(double a,double x); 00055 00056 private: 00057 00058 double GamCf(double a,double x); 00059 double GamSer(double a,double x); 00060 00061 // Abs 00062 static short Abs(short d) { return (d > 0) ? d : -d; } 00063 static int Abs(int d) { return (d > 0) ? d : -d; } 00064 static long Abs(long d) { return (d > 0) ? d : -d; } 00065 static float Abs(float d) { return (d > 0) ? d : -d; } 00066 static double Abs(double d) { return (d > 0) ? d : -d; } 00067 static double LnGamma(double z); 00068 static double Log(double x) { return std::log(x); } 00069 static double Exp(double x) { return std::exp(x); } 00070 }; 00071 00072 #endif