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1 // 1 // 2 // ******************************************* 2 // ******************************************************************** 3 // * License and Disclaimer 3 // * License and Disclaimer * 4 // * 4 // * * 5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of * 6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and * 7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file * 8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These * 9 // * include a list of copyright holders. 9 // * include a list of copyright holders. * 10 // * 10 // * * 11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // G4SimpleRunge implementation << 27 // 26 // 28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 27 // $Id: G4SimpleRunge.cc 66356 2012-12-18 09:02:32Z gcosmo $ >> 28 // >> 29 // Simple Runge: >> 30 // >> 31 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) ) >> 32 // >> 33 // Second order solver. >> 34 // Takes the derivative at a position to be assumed at the middle of the >> 35 // Step and adds it to the current position. >> 36 // >> 37 // >> 38 // W.Wander <wwc@mit.edu> 12/09/97 29 // ------------------------------------------- 39 // ------------------------------------------------------------------- 30 40 31 #include "G4SimpleRunge.hh" 41 #include "G4SimpleRunge.hh" 32 #include "G4ThreeVector.hh" 42 #include "G4ThreeVector.hh" 33 43 34 ////////////////////////////////////////////// 44 //////////////////////////////////////////////////////////////// 35 // 45 // 36 // Constructor 46 // Constructor 37 // << 47 38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotio 48 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotion* EqRhs, G4int numberOfVariables) 39 : G4MagErrorStepper(EqRhs, numberOfVariables 49 : G4MagErrorStepper(EqRhs, numberOfVariables), 40 fNumberOfVariables(numberOfVariables) 50 fNumberOfVariables(numberOfVariables) 41 { 51 { 42 52 43 unsigned int noVariables= std::max(numberOf 53 unsigned int noVariables= std::max(numberOfVariables, 44 GetNumbe << 54 GetNumberOfStateVariables()); 45 / 55 // To deal with Time >= 7+1 46 dydxTemp = new G4double[noVariables] ; 56 dydxTemp = new G4double[noVariables] ; 47 yTemp = new G4double[noVariables] ; 57 yTemp = new G4double[noVariables] ; 48 } 58 } 49 59 >> 60 50 ////////////////////////////////////////////// 61 ///////////////////////////////////////////////////////////////// 51 // 62 // 52 // Destructor 63 // Destructor 53 // << 64 54 G4SimpleRunge::~G4SimpleRunge() 65 G4SimpleRunge::~G4SimpleRunge() 55 { 66 { 56 delete [] dydxTemp; << 67 delete[] dydxTemp; 57 delete [] yTemp; << 68 delete[] yTemp; 58 } 69 } 59 70 60 ////////////////////////////////////////////// 71 ////////////////////////////////////////////////////////////////// 61 // 72 // 62 // DumbStepper << 63 // 73 // >> 74 64 void 75 void 65 G4SimpleRunge::DumbStepper( const G4double yI 76 G4SimpleRunge::DumbStepper( const G4double yIn[], 66 const G4double dy << 77 const G4double dydx[], 67 G4double h, << 78 G4double h, 68 G4double y << 79 G4double yOut[]) 69 { 80 { 70 // Initialise time to t0, needed when it is 81 // Initialise time to t0, needed when it is not updated by the integration. 71 // << 82 yTemp[7] = yOut[7] = yIn[7]; // Better to set it to NaN; // TODO 72 yTemp[7] = yOut[7] = yIn[7]; << 83 >> 84 G4int i; 73 85 74 for( G4int i = 0; i < fNumberOfVariables; ++ << 86 for( i = 0; i < fNumberOfVariables; i++ ) 75 { 87 { 76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ; 88 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ; 77 } 89 } 78 90 79 RightHandSide(yTemp,dydxTemp); 91 RightHandSide(yTemp,dydxTemp); 80 92 81 for( G4int i = 0; i < fNumberOfVariables; ++ << 93 for( i = 0; i < fNumberOfVariables; i++ ) 82 { 94 { 83 yOut[i] = yIn[i] + h * ( dydxTemp[i] ); 95 yOut[i] = yIn[i] + h * ( dydxTemp[i] ); 84 } 96 } 85 } 97 } 86 98