| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | //
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| 28 | // $Id: Gamma.hh,v 1.6 2006/06/29 19:14:08 gunter Exp $
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| 29 | // GEANT4 tag $Name: HEAD $
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| 30 | //
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| 31 | //
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| 32 | //---------------------------------------------------------------
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| 33 | // GEANT 4 class header file
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| 34 | //
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| 35 | // Gamma
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| 36 | //
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| 37 | // Class description:
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| 38 | //
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| 39 | // Gamma function.
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| 40 |
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| 41 | //---------------------------------------------------------------
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| 42 | #ifndef MYGAMMA_H
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| 43 | #define MYGAMMA_H
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| 44 |
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| 45 | #include <cmath>
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| 46 |
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| 47 | class MyGamma
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| 48 | {
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| 49 | public:
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| 50 |
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| 51 | MyGamma ();
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| 52 | ~MyGamma();
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| 53 |
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| 54 | double Gamma(double z);
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| 55 | double Gamma(double a,double x);
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| 56 |
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| 57 | private:
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| 58 |
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| 59 | double GamCf(double a,double x);
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| 60 | double GamSer(double a,double x);
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| 61 |
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| 62 | // Abs
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| 63 | static short Abs(short d) { return (d > 0) ? d : -d; }
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| 64 | static int Abs(int d) { return (d > 0) ? d : -d; }
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| 65 | static long Abs(long d) { return (d > 0) ? d : -d; }
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| 66 | static float Abs(float d) { return (d > 0) ? d : -d; }
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| 67 | static double Abs(double d) { return (d > 0) ? d : -d; }
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| 68 | static double LnGamma(double z);
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| 69 | static double Log(double x) { return std::log(x); }
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| 70 | static double Exp(double x) { return std::exp(x); }
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| 71 | };
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| 72 |
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| 73 | #endif
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