| [1197] | 1 | //
|
|---|
| 2 | // ********************************************************************
|
|---|
| 3 | // * License and Disclaimer *
|
|---|
| 4 | // * *
|
|---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
|
|---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
|
|---|
| 7 | // * conditions of the Geant4 Software License, included in the file *
|
|---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
|
|---|
| 9 | // * include a list of copyright holders. *
|
|---|
| 10 | // * *
|
|---|
| 11 | // * Neither the authors of this software system, nor their employing *
|
|---|
| 12 | // * institutes,nor the agencies providing financial support for this *
|
|---|
| 13 | // * work make any representation or warranty, express or implied, *
|
|---|
| 14 | // * regarding this software system or assume any liability for its *
|
|---|
| 15 | // * use. Please see the license in the file LICENSE and URL above *
|
|---|
| 16 | // * for the full disclaimer and the limitation of liability. *
|
|---|
| 17 | // * *
|
|---|
| 18 | // * This code implementation is the result of the scientific and *
|
|---|
| 19 | // * technical work of the GEANT4 collaboration. *
|
|---|
| 20 | // * By using, copying, modifying or distributing the software (or *
|
|---|
| 21 | // * any work based on the software) you agree to acknowledge its *
|
|---|
| 22 | // * use in resulting scientific publications, and indicate your *
|
|---|
| 23 | // * acceptance of all terms of the Geant4 Software license. *
|
|---|
| 24 | // ********************************************************************
|
|---|
| 25 | //
|
|---|
| [1340] | 26 | // $Id: G4Pow.cc,v 1.4 2010/08/24 08:12:08 gcosmo Exp $
|
|---|
| 27 | // GEANT4 tag $Name: global-V09-03-22 $
|
|---|
| [1197] | 28 | //
|
|---|
| 29 | // -------------------------------------------------------------------
|
|---|
| 30 | //
|
|---|
| 31 | // GEANT4 Class file
|
|---|
| 32 | //
|
|---|
| 33 | //
|
|---|
| 34 | // File name: G4Pow
|
|---|
| 35 | //
|
|---|
| 36 | // Author: Vladimir Ivanchenko
|
|---|
| 37 | //
|
|---|
| 38 | // Creation date: 23.05.2009
|
|---|
| 39 | //
|
|---|
| 40 | // -------------------------------------------------------------------
|
|---|
| 41 |
|
|---|
| 42 | #include "G4Pow.hh"
|
|---|
| 43 |
|
|---|
| 44 | G4Pow* G4Pow::fInstance = 0;
|
|---|
| 45 |
|
|---|
| 46 | // -------------------------------------------------------------------
|
|---|
| 47 |
|
|---|
| 48 | G4Pow* G4Pow::GetInstance()
|
|---|
| 49 | {
|
|---|
| 50 | if (fInstance == 0)
|
|---|
| 51 | {
|
|---|
| 52 | static G4Pow manager;
|
|---|
| 53 | fInstance = &manager;
|
|---|
| 54 | }
|
|---|
| 55 | return fInstance;
|
|---|
| 56 | }
|
|---|
| 57 |
|
|---|
| 58 | // -------------------------------------------------------------------
|
|---|
| 59 |
|
|---|
| 60 | G4Pow::G4Pow()
|
|---|
| 61 | {
|
|---|
| 62 | const G4int maxZ = 256;
|
|---|
| 63 |
|
|---|
| 64 | pz13.resize(maxZ,0.0);
|
|---|
| 65 | lz.resize(maxZ,0.0);
|
|---|
| 66 | fact.resize(maxZ,0.0);
|
|---|
| [1340] | 67 | logfact.resize(maxZ,0.0);
|
|---|
| [1197] | 68 |
|
|---|
| 69 | onethird = 1.0/3.0;
|
|---|
| 70 | G4double f = 1.0;
|
|---|
| 71 |
|
|---|
| [1340] | 72 | for(G4int i=1; i<maxZ; ++i)
|
|---|
| [1197] | 73 | {
|
|---|
| 74 | G4double x = G4double(i);
|
|---|
| 75 | pz13[i] = std::pow(x,onethird);
|
|---|
| 76 | lz[i] = std::log(x);
|
|---|
| 77 | f *= x;
|
|---|
| 78 | fact[i] = f;
|
|---|
| [1340] | 79 | logfact[i] = std::log(f);
|
|---|
| [1197] | 80 | }
|
|---|
| 81 | fact[0] = 1.0;
|
|---|
| [1340] | 82 | logfact[0] = 0.0;
|
|---|
| [1197] | 83 | }
|
|---|
| 84 |
|
|---|
| 85 | // -------------------------------------------------------------------
|
|---|
| 86 |
|
|---|
| 87 | G4Pow::~G4Pow()
|
|---|
| 88 | {}
|
|---|
| 89 |
|
|---|
| 90 | // -------------------------------------------------------------------
|
|---|
| [1340] | 91 |
|
|---|
| 92 | G4double G4Pow::powN(G4double x, G4int n)
|
|---|
| 93 | {
|
|---|
| 94 | G4double res = 1.0;
|
|---|
| 95 | if(n >= 0) { for(G4int i=0; i<n; ++i) { res *= x; } }
|
|---|
| 96 | else if((n < 0) && (x != 0.0))
|
|---|
| 97 | {
|
|---|
| 98 | G4double y = 1.0/x;
|
|---|
| 99 | G4int nn = -n;
|
|---|
| 100 | for(G4int i=0; i<nn; ++i) { res *= y; }
|
|---|
| 101 | }
|
|---|
| 102 | return res;
|
|---|
| 103 | }
|
|---|
